2156331261236 has 48 divisors (see below), whose sum is σ = 3906306066432. Its totient is φ = 1040802048000.

The previous prime is 2156331261221. The next prime is 2156331261251. The reversal of 2156331261236 is 6321621336512.

It is an interprime number because it is at equal distance from previous prime (2156331261221) and next prime (2156331261251).

It is a Harshad number since it is a multiple of its sum of digits (41).

Its product of digits (233280) is a multiple of the sum of its prime factors (29160).

It is a junction number, because it is equal to n+sod(n) for n = 2156331261193 and 2156331261202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93066125 + ... + 93089291.

It is an arithmetic number, because the mean of its divisors is an integer number (81381376384).

Almost surely, 2^{2156331261236} is an apocalyptic number.

It is an amenable number.

2156331261236 is a deficient number, since it is larger than the sum of its proper divisors (1749974805196).

2156331261236 is a wasteful number, since it uses less digits than its factorization.

2156331261236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29160 (or 29158 counting only the distinct ones).

The product of its digits is 233280, while the sum is 41.

Adding to 2156331261236 its reverse (6321621336512), we get a palindrome (8477952597748).

The spelling of 2156331261236 in words is "two trillion, one hundred fifty-six billion, three hundred thirty-one million, two hundred sixty-one thousand, two hundred thirty-six".