2121640236244 has 12 divisors (see below), whose sum is σ = 3713089412704. Its totient is φ = 1060757546904.

The previous prime is 2121640236239. The next prime is 2121640236301. The reversal of 2121640236244 is 4426320461212.

It is a super-2 number, since 2×2121640236244² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 15566472 + ... + 15702175.

Almost surely, 2^{2121640236244} is an apocalyptic number.

It is an amenable number.

2121640236244 is a deficient number, since it is larger than the sum of its proper divisors (1591449176460).

2121640236244 is a wasteful number, since it uses less digits than its factorization.

2121640236244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31285614 (or 31285612 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 2121640236244 its reverse (4426320461212), we get a palindrome (6547960697456).

The spelling of 2121640236244 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, two hundred thirty-six thousand, two hundred forty-four".