21605372339460 has 192 divisors, whose sum is σ = 76039596122112. Its totient is φ = 4461506809344.

The previous prime is 21605372339431. The next prime is 21605372339533. The reversal of 21605372339460 is 6493327350612.

It is a super-2 number, since 2×21605372339460² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41839422 + ... + 42352661.

It is an arithmetic number, because the mean of its divisors is an integer number (396039563136).

Almost surely, 2^{21605372339460} is an apocalyptic number.

21605372339460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21605372339460 is an abundant number, since it is smaller than the sum of its proper divisors (54434223782652).

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

21605372339460 is a wasteful number, since it uses less digits than its factorization.

21605372339460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84192162 (or 84192160 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 51.

The spelling of 21605372339460 in words is "twenty-one trillion, six hundred five billion, three hundred seventy-two million, three hundred thirty-nine thousand, four hundred sixty".