21675215210 has 32 divisors (see below), whose sum is σ = 42914021184. Its totient is φ = 7881891600.

The previous prime is 21675215209. The next prime is 21675215251. The reversal of 21675215210 is 1251257612.

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, 800936 + ... + 827555.

It is an arithmetic number, because the mean of its divisors is an integer number (1341063162).

Almost surely, 2^21675215210 is an apocalyptic number.

21675215210 is a deficient number, since it is larger than the sum of its proper divisors (21238805974).

21675215210 is a wasteful number, since it uses less digits than its factorization.

21675215210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628531 (or 1628509 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 21675215210 in words is "twenty-one billion, six hundred seventy-five million, two hundred fifteen thousand, two hundred ten".