21501154140312 has 256 divisors, whose sum is σ = 68393404800000. Its totient is φ = 5583969377280.

The previous prime is 21501154140293. The next prime is 21501154140313. The reversal of 21501154140312 is 21304145110512.

It is a self number, because there is not a number n which added to its sum of digits gives 21501154140312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501154140313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1096484364 + ... + 1096503972.

It is an arithmetic number, because the mean of its divisors is an integer number (267161737500).

Almost surely, 2^{21501154140312} is an apocalyptic number.

21501154140312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21501154140312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34196702400000).

21501154140312 is an abundant number, since it is smaller than the sum of its proper divisors (46892250659688).

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

21501154140312 is a wasteful number, since it uses less digits than its factorization.

21501154140312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31759 (or 31741 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

Adding to 21501154140312 its reverse (21304145110512), we get a palindrome (42805299250824).

The spelling of 21501154140312 in words is "twenty-one trillion, five hundred one billion, one hundred fifty-four million, one hundred forty thousand, three hundred twelve".