21149263530 has 24 divisors (see below), whose sum is σ = 54988085412. Its totient is φ = 5639803584.

The previous prime is 21149263481. The next prime is 21149263567. The reversal of 21149263530 is 3536294112.

21149263530 is a `hidden beast` number, since 2 + 1 + 14 + 9 + 2 + 635 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18289046169 + 2860217361 = 135237^2 + 53481^2 .

It is a super-2 number, since 2×21149263530² (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 11 ways as a sum of consecutive naturals, for example, 117495819 + ... + 117495998.

Almost surely, 2^21149263530 is an apocalyptic number.

21149263530 is an abundant number, since it is smaller than the sum of its proper divisors (33838821882).

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

21149263530 is a wasteful number, since it uses less digits than its factorization.

21149263530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234991830 (or 234991827 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21149263530 in words is "twenty-one billion, one hundred forty-nine million, two hundred sixty-three thousand, five hundred thirty".