21403505232 has 80 divisors (see below), whose sum is σ = 64107146880. Its totient is φ = 6824302848.

The previous prime is 21403505219. The next prime is 21403505237. The reversal of 21403505232 is 23250530412.

It is a happy number.

21403505232 is a `hidden beast` number, since 21 + 403 + 5 + 0 + 5 + 232 = 666.

It is a super-2 number, since 2×21403505232² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21403505196 and 21403505205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403505237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067133 + ... + 1087004.

It is an arithmetic number, because the mean of its divisors is an integer number (801339336).

Almost surely, 2^21403505232 is an apocalyptic number.

It is an amenable number.

21403505232 is an abundant number, since it is smaller than the sum of its proper divisors (42703641648).

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

21403505232 is a wasteful number, since it uses less digits than its factorization.

21403505232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154177 (or 2154165 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21403505232 in words is "twenty-one billion, four hundred three million, five hundred five thousand, two hundred thirty-two".