21403902532 has 6 divisors (see below), whose sum is σ = 37456829438. Its totient is φ = 10701951264.

The previous prime is 21403902521. The next prime is 21403902577. The reversal of 21403902532 is 23520930412.

It can be written as a sum of positive squares in only one way, i.e., 18729564736 + 2674337796 = 136856^2 + 51714^2 .

It is a super-2 number, since 2×21403902532² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21403902494 and 21403902503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675487813 + ... + 2675487820.

Almost surely, 2^21403902532 is an apocalyptic number.

It is an amenable number.

21403902532 is a deficient number, since it is larger than the sum of its proper divisors (16052926906).

21403902532 is a wasteful number, since it uses less digits than its factorization.

21403902532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350975637 (or 5350975635 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21403902532 in words is "twenty-one billion, four hundred three million, nine hundred two thousand, five hundred thirty-two".