21121656523326 has 40 divisors (see below), whose sum is σ = 47343321837504. Its totient is φ = 7038296141760.

The previous prime is 21121656523313. The next prime is 21121656523369. The reversal of 21121656523326 is 62332565612112.

21121656523326 is a `hidden beast` number, since 2 + 1 + 1 + 216 + 56 + 52 + 332 + 6 = 666.

It is a super-2 number, since 2×21121656523326² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20382030 + ... + 21393233.

Almost surely, 2^{21121656523326} is an apocalyptic number.

21121656523326 is an abundant number, since it is smaller than the sum of its proper divisors (26221665314178).

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

21121656523326 is a wasteful number, since it uses less digits than its factorization.

21121656523326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41778398 (or 41778389 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 21121656523326 in words is "twenty-one trillion, one hundred twenty-one billion, six hundred fifty-six million, five hundred twenty-three thousand, three hundred twenty-six".