21901397514 has 32 divisors (see below), whose sum is σ = 45235723776. Its totient is φ = 7061852160.

The previous prime is 21901397503. The next prime is 21901397519. The reversal of 21901397514 is 41579310912.

It is not an unprimeable number, because it can be changed into a prime (21901397519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417354 + ... + 466890.

It is an arithmetic number, because the mean of its divisors is an integer number (1413616368).

Almost surely, 2^21901397514 is an apocalyptic number.

21901397514 is an abundant number, since it is smaller than the sum of its proper divisors (23334326262).

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

21901397514 is a wasteful number, since it uses less digits than its factorization.

21901397514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51950.

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 21901397514 in words is "twenty-one billion, nine hundred one million, three hundred ninety-seven thousand, five hundred fourteen".