21709295852 has 6 divisors (see below), whose sum is σ = 37991267748. Its totient is φ = 10854647924.

The previous prime is 21709295849. The next prime is 21709295873. The reversal of 21709295852 is 25859290712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21709295852.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2713661978 + ... + 2713661985.

It is an arithmetic number, because the mean of its divisors is an integer number (6331877958).

Almost surely, 2^21709295852 is an apocalyptic number.

It is an amenable number.

21709295852 is a deficient number, since it is larger than the sum of its proper divisors (16281971896).

21709295852 is a wasteful number, since it uses less digits than its factorization.

21709295852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5427323967 (or 5427323965 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 21709295852 in words is "twenty-one billion, seven hundred nine million, two hundred ninety-five thousand, eight hundred fifty-two".