2123236881 has 20 divisors (see below), whose sum is σ = 3309653952. Its totient is φ = 1353946968.

The previous prime is 2123236873. The next prime is 2123236919. The reversal of 2123236881 is 1886323212.

2123236881 is a `hidden beast` number, since 212 + 3 + 2 + 368 + 81 = 666.

It is not a de Polignac number, because 2123236881 - 2³ = 2123236873 is a prime.

It is a super-2 number, since 2×2123236881² = 9016269705677216322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2123236081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 567981 + ... + 571706.

Almost surely, 2^2123236881 is an apocalyptic number.

It is an amenable number.

2123236881 is a deficient number, since it is larger than the sum of its proper divisors (1186417071).

2123236881 is a wasteful number, since it uses less digits than its factorization.

2123236881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139722 (or 1139713 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 2123236881 is about 46078.5946074747. The cubic root of 2123236881 is about 1285.2851302454.

The spelling of 2123236881 in words is "two billion, one hundred twenty-three million, two hundred thirty-six thousand, eight hundred eighty-one".