21841250640 has 160 divisors (see below), whose sum is σ = 74277388800. Its totient is φ = 5265154560.

The previous prime is 21841250621. The next prime is 21841250681. The reversal of 21841250640 is 4605214812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449451 + ... + 495669.

It is an arithmetic number, because the mean of its divisors is an integer number (464233680).

Almost surely, 2^21841250640 is an apocalyptic number.

21841250640 is a gapful number since it is divisible by the number (20) 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 21841250640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37138694400).

21841250640 is an abundant number, since it is smaller than the sum of its proper divisors (52436138160).

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

21841250640 is a wasteful number, since it uses less digits than its factorization.

21841250640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46425 (or 46419 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 21841250640 in words is "twenty-one billion, eight hundred forty-one million, two hundred fifty thousand, six hundred forty".