21126577136 has 40 divisors (see below), whose sum is σ = 48814209024. Its totient is φ = 8660583360.

The previous prime is 21126577091. The next prime is 21126577177. The reversal of 21126577136 is 63177562112.

It is a super-2 number, since 2×21126577136² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21126577093 and 21126577102.

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 7 ways as a sum of consecutive naturals, for example, 4098080 + ... + 4103231.

Almost surely, 2^21126577136 is an apocalyptic number.

It is an amenable number.

21126577136 is an abundant number, since it is smaller than the sum of its proper divisors (27687631888).

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

21126577136 is a wasteful number, since it uses less digits than its factorization.

21126577136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8201349 (or 8201343 counting only the distinct ones).

The product of its digits is 105840, while the sum is 41.

The spelling of 21126577136 in words is "twenty-one billion, one hundred twenty-six million, five hundred seventy-seven thousand, one hundred thirty-six".