21390101264 has 20 divisors (see below), whose sum is σ = 47363795904. Its totient is φ = 9167186208.

The previous prime is 21390101237. The next prime is 21390101309. The reversal of 21390101264 is 46210109312.

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 3 ways as a sum of consecutive naturals, for example, 95491412 + ... + 95491635.

Almost surely, 2^21390101264 is an apocalyptic number.

It is an amenable number.

21390101264 is an abundant number, since it is smaller than the sum of its proper divisors (25973694640).

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

21390101264 is a wasteful number, since it uses less digits than its factorization.

21390101264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190983062 (or 190983056 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 21390101264 in words is "twenty-one billion, three hundred ninety million, one hundred one thousand, two hundred sixty-four".