2122438145881 has 27 divisors (see below), whose sum is σ = 2194109446581. Its totient is φ = 2053087286904.

The previous prime is 2122438145813. The next prime is 2122438145899. The reversal of 2122438145881 is 1885418342212.

The square root of 2122438145881 is 1456859.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2122438145881 - 2⁷ = 2122438145753 is a prime.

It is a super-2 number, since 2×2122438145881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2122438145281) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9517659736 + ... + 9517659958.

Almost surely, 2^{2122438145881} is an apocalyptic number.

2122438145881 is the 1456859-th square number.

2122438145881 is the 728430-th centered octagonal number.

It is an amenable number.

2122438145881 is a deficient number, since it is larger than the sum of its proper divisors (71671300700).

2122438145881 is an frugal number, since it uses more digits than its factorization.

2122438145881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 409 counting only the distinct ones).

The product of its digits is 983040, while the sum is 49.

Multiplying 2122438145881 by its sum of digits (49), we get a square (103999469148169 = 10198013²).

The spelling of 2122438145881 in words is "two trillion, one hundred twenty-two billion, four hundred thirty-eight million, one hundred forty-five thousand, eight hundred eighty-one".