2156643513124 has 12 divisors (see below), whose sum is σ = 3774497359500. Its totient is φ = 1078215696128.

The previous prime is 2156643513121. The next prime is 2156643513127. The reversal of 2156643513124 is 4213153466512.

It is an interprime number because it is at equal distance from previous prime (2156643513121) and next prime (2156643513127).

It can be written as a sum of positive squares in 2 ways, for example, as 865238553124 + 1291404960000 = 930182^2 + 1136400^2 .

It is a super-2 number, since 2×2156643513124² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2156643513121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26469349 + ... + 26550700.

It is an arithmetic number, because the mean of its divisors is an integer number (314541446625).

Almost surely, 2^{2156643513124} is an apocalyptic number.

It is an amenable number.

2156643513124 is a deficient number, since it is larger than the sum of its proper divisors (1617853846376).

2156643513124 is a wasteful number, since it uses less digits than its factorization.

2156643513124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53030222 (or 53030220 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

Adding to 2156643513124 its reverse (4213153466512), we get a palindrome (6369796979636).

The spelling of 2156643513124 in words is "two trillion, one hundred fifty-six billion, six hundred forty-three million, five hundred thirteen thousand, one hundred twenty-four".