21140234344 has 16 divisors (see below), whose sum is σ = 39674088900. Its totient is φ = 10560477312.

The previous prime is 21140234327. The next prime is 21140234399. The reversal of 21140234344 is 44343204112.

It can be written as a sum of positive squares in 2 ways, for example, as 19192777444 + 1947456900 = 138538^2 + 44130^2 .

It is a super-2 number, since 2×21140234344² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1195659 + ... + 1213210.

Almost surely, 2^21140234344 is an apocalyptic number.

It is an amenable number.

21140234344 is a deficient number, since it is larger than the sum of its proper divisors (18533854556).

21140234344 is a wasteful number, since it uses less digits than its factorization.

21140234344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409972 (or 2409968 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21140234344 its reverse (44343204112), we get a palindrome (65483438456).

The spelling of 21140234344 in words is "twenty-one billion, one hundred forty million, two hundred thirty-four thousand, three hundred forty-four".