2125551138 has 16 divisors (see below), whose sum is σ = 4251606240. Its totient is φ = 708433056.

The previous prime is 2125551137. The next prime is 2125551149. The reversal of 2125551138 is 8311555212.

It is a junction number, because it is equal to n+sod(n) for n = 2125551099 and 2125551108.

It is not an unprimeable number, because it can be changed into a prime (2125551137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54981 + ... + 85287.

It is an arithmetic number, because the mean of its divisors is an integer number (265725390).

Almost surely, 2^2125551138 is an apocalyptic number.

2125551138 is an abundant number, since it is smaller than the sum of its proper divisors (2126055102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2125551138 is a wasteful number, since it uses less digits than its factorization.

2125551138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42001.

The product of its digits is 12000, while the sum is 33.

The square root of 2125551138 is about 46103.6998298401. The cubic root of 2125551138 is about 1285.7519332503.

The spelling of 2125551138 in words is "two billion, one hundred twenty-five million, five hundred fifty-one thousand, one hundred thirty-eight".