21663653032 has 48 divisors (see below), whose sum is σ = 48528168660. Its totient is φ = 9033486336.

The previous prime is 21663653023. The next prime is 21663653101. The reversal of 21663653032 is 23035636612.

It can be written as a sum of positive squares in 2 ways, for example, as 16155935236 + 5507717796 = 127106^2 + 74214^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 21663652982 and 21663653000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 732313 + ... + 761320.

Almost surely, 2^21663653032 is an apocalyptic number.

It is an amenable number.

21663653032 is an abundant number, since it is smaller than the sum of its proper divisors (26864515628).

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

21663653032 is a wasteful number, since it uses less digits than its factorization.

21663653032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493690 (or 1493679 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 37.

The spelling of 21663653032 in words is "twenty-one billion, six hundred sixty-three million, six hundred fifty-three thousand, thirty-two".