21245461328 has 80 divisors (see below), whose sum is σ = 51840598656. Its totient is φ = 8209313280.

The previous prime is 21245461313. The next prime is 21245461339. The reversal of 21245461328 is 82316454212.

It is a junction number, because it is equal to n+sod(n) for n = 21245461291 and 21245461300.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 107063 + ... + 232278.

Almost surely, 2^21245461328 is an apocalyptic number.

21245461328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21245461328 is an abundant number, since it is smaller than the sum of its proper divisors (30595137328).

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

21245461328 is a wasteful number, since it uses less digits than its factorization.

21245461328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339412 (or 339406 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The spelling of 21245461328 in words is "twenty-one billion, two hundred forty-five million, four hundred sixty-one thousand, three hundred twenty-eight".