21135459762 has 20 divisors (see below), whose sum is σ = 47359086126. Its totient is φ = 7045153200.

The previous prime is 21135459739. The next prime is 21135459781. The reversal of 21135459762 is 26795453112.

21135459762 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 54 + 597 + 6 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18052878321 + 3082581441 = 134361^2 + 55521^2 .

It is a super-2 number, since 2×21135459762² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65232739 + ... + 65233062.

Almost surely, 2^21135459762 is an apocalyptic number.

21135459762 is an abundant number, since it is smaller than the sum of its proper divisors (26223626364).

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

21135459762 is a wasteful number, since it uses less digits than its factorization.

21135459762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130465815 (or 130465806 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 21135459762 in words is "twenty-one billion, one hundred thirty-five million, four hundred fifty-nine thousand, seven hundred sixty-two".