21156501714 has 32 divisors (see below), whose sum is σ = 43124114880. Its totient is φ = 6918264000.

The previous prime is 21156501697. The next prime is 21156501719. The reversal of 21156501714 is 41710565112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21156501719) 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, 94092 + ... + 226199.

It is an arithmetic number, because the mean of its divisors is an integer number (1347628590).

Almost surely, 2^21156501714 is an apocalyptic number.

21156501714 is an abundant number, since it is smaller than the sum of its proper divisors (21967613166).

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

21156501714 is a wasteful number, since it uses less digits than its factorization.

21156501714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320506.

The product of its (nonzero) digits is 8400, while the sum is 33.

The spelling of 21156501714 in words is "twenty-one billion, one hundred fifty-six million, five hundred one thousand, seven hundred fourteen".