21465065652 has 48 divisors (see below), whose sum is σ = 52564982400. Its totient is φ = 6804358528.

The previous prime is 21465065647. The next prime is 21465065669. The reversal of 21465065652 is 25656056412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177027 + ... + 272522.

It is an arithmetic number, because the mean of its divisors is an integer number (1095103800).

Almost surely, 2^21465065652 is an apocalyptic number.

It is an amenable number.

21465065652 is an abundant number, since it is smaller than the sum of its proper divisors (31099916748).

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

21465065652 is a wasteful number, since it uses less digits than its factorization.

21465065652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449752 (or 449750 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 21465065652 in words is "twenty-one billion, four hundred sixty-five million, sixty-five thousand, six hundred fifty-two".