21615369952 has 48 divisors (see below), whose sum is σ = 46983307392. Its totient is φ = 9706779520.

The previous prime is 21615369929. The next prime is 21615369961. The reversal of 21615369952 is 25996351612.

It is a junction number, because it is equal to n+sod(n) for n = 21615369896 and 21615369905.

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 7 ways as a sum of consecutive naturals, for example, 340708 + ... + 399139.

It is an arithmetic number, because the mean of its divisors is an integer number (978818904).

Almost surely, 2^21615369952 is an apocalyptic number.

21615369952 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21615369952 is an abundant number, since it is smaller than the sum of its proper divisors (25367937440).

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

21615369952 is a wasteful number, since it uses less digits than its factorization.

21615369952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739951 (or 739943 counting only the distinct ones).

The product of its digits is 874800, while the sum is 49.

The spelling of 21615369952 in words is "twenty-one billion, six hundred fifteen million, three hundred sixty-nine thousand, nine hundred fifty-two".