21640114052 has 18 divisors (see below), whose sum is σ = 39588322158. Its totient is φ = 10349618752.

The previous prime is 21640114043. The next prime is 21640114063. The reversal of 21640114052 is 25041104612.

It can be written as a sum of positive squares in only one way, i.e., 17930816836 + 3709297216 = 133906^2 + 60904^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5111333 + ... + 5115564.

It is an arithmetic number, because the mean of its divisors is an integer number (2199351231).

Almost surely, 2^21640114052 is an apocalyptic number.

It is an amenable number.

21640114052 is a deficient number, since it is larger than the sum of its proper divisors (17948208106).

21640114052 is a wasteful number, since it uses less digits than its factorization.

21640114052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10226947 (or 10226922 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21640114052 its reverse (25041104612), we get a palindrome (46681218664).

The spelling of 21640114052 in words is "twenty-one billion, six hundred forty million, one hundred fourteen thousand, fifty-two".