21045948936 has 64 divisors (see below), whose sum is σ = 53428636800. Its totient is φ = 6907084800.

The previous prime is 21045948901. The next prime is 21045948953. The reversal of 21045948936 is 63984954012.

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 in 15 ways as a sum of consecutive naturals, for example, 1302346 + ... + 1318406.

It is an arithmetic number, because the mean of its divisors is an integer number (834822450).

Almost surely, 2^21045948936 is an apocalyptic number.

It is an amenable number.

21045948936 is an abundant number, since it is smaller than the sum of its proper divisors (32382687864).

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

21045948936 is a wasteful number, since it uses less digits than its factorization.

21045948936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16910 (or 16906 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 21045948936 in words is "twenty-one billion, forty-five million, nine hundred forty-eight thousand, nine hundred thirty-six".