21602688412 has 12 divisors (see below), whose sum is σ = 37805743080. Its totient is φ = 10801047536.

The previous prime is 21602688353. The next prime is 21602688431. The reversal of 21602688412 is 21488620612.

It is a happy number.

It is a super-2 number, since 2×21602688412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214539 + ... + 298717.

It is an arithmetic number, because the mean of its divisors is an integer number (3150478590).

Almost surely, 2^21602688412 is an apocalyptic number.

It is an amenable number.

21602688412 is a deficient number, since it is larger than the sum of its proper divisors (16203054668).

21602688412 is a wasteful number, since it uses less digits than its factorization.

21602688412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148340 (or 148338 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 21602688412 in words is "twenty-one billion, six hundred two million, six hundred eighty-eight thousand, four hundred twelve".