21602950656 has 480 divisors, whose sum is σ = 70936031232. Its totient is φ = 5816401920.

The previous prime is 21602950637. The next prime is 21602950709. The reversal of 21602950656 is 65605920612.

It is a super-3 number, since 3×21602950656³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109659550 + ... + 109659746.

Almost surely, 2^21602950656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21602950656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35468015616).

21602950656 is an abundant number, since it is smaller than the sum of its proper divisors (49333080576).

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

21602950656 is a wasteful number, since it uses less digits than its factorization.

21602950656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 21602950656 in words is "twenty-one billion, six hundred two million, nine hundred fifty thousand, six hundred fifty-six".