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21048908151390 = 23572711071884821
BaseRepresentation
bin1001100100100110101001…
…01100010111101001011110
32202112020220121012110001020
410302103110230113221132
510224331130441321030
6112433422424025010
74301506365140400
oct462232454275136
982466817173036
1021048908151390
1167858789a8a59
12243b504902166
13b98b99063912
1452aab5db8b70
152677e51bb510
hex1324d4b17a5e

21048908151390 has 192 divisors, whose sum is σ = 60149766578688. Its totient is φ = 4699082438400.

The previous prime is 21048908151373. The next prime is 21048908151391. The reversal of 21048908151390 is 9315180984012.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21048908151391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10225180 + ... + 12110000.

It is an arithmetic number, because the mean of its divisors is an integer number (313280034264).

Almost surely, 221048908151390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21048908151390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30074883289344).

21048908151390 is an abundant number, since it is smaller than the sum of its proper divisors (39100858427298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21048908151390 is a wasteful number, since it uses less digits than its factorization.

21048908151390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885023 (or 1885016 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 21048908151390 in words is "twenty-one trillion, forty-eight billion, nine hundred eight million, one hundred fifty-one thousand, three hundred ninety".