21305393032 has 32 divisors (see below), whose sum is σ = 49804816320. Its totient is φ = 8300802240.

The previous prime is 21305393009. The next prime is 21305393041. The reversal of 21305393032 is 23039350312.

It is a junction number, because it is equal to n+sod(n) for n = 21305392985 and 21305393003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17292723 + ... + 17293954.

It is an arithmetic number, because the mean of its divisors is an integer number (1556400510).

Almost surely, 2^21305393032 is an apocalyptic number.

21305393032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21305393032 is an abundant number, since it is smaller than the sum of its proper divisors (28499423288).

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

21305393032 is a wasteful number, since it uses less digits than its factorization.

21305393032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34586701 (or 34586697 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 31.

The spelling of 21305393032 in words is "twenty-one billion, three hundred five million, three hundred ninety-three thousand, thirty-two".