21295667528 has 16 divisors (see below), whose sum is σ = 40525338480. Its totient is φ = 10488910608.

The previous prime is 21295667453. The next prime is 21295667531. The reversal of 21295667528 is 82576659212.

It is a happy number.

It is a super-2 number, since 2×21295667528² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21295667528.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19864826 + ... + 19865897.

It is an arithmetic number, because the mean of its divisors is an integer number (2532833655).

Almost surely, 2^21295667528 is an apocalyptic number.

It is an amenable number.

21295667528 is a deficient number, since it is larger than the sum of its proper divisors (19229670952).

21295667528 is a wasteful number, since it uses less digits than its factorization.

21295667528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39730796 (or 39730792 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 53.

The spelling of 21295667528 in words is "twenty-one billion, two hundred ninety-five million, six hundred sixty-seven thousand, five hundred twenty-eight".