2137888221 has 16 divisors (see below), whose sum is σ = 3271372800. Its totient is φ = 1216536048.

The previous prime is 2137888217. The next prime is 2137888229. The reversal of 2137888221 is 1228887312.

It is not a de Polignac number, because 2137888221 - 2² = 2137888217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2137888229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207961 + ... + 217998.

It is an arithmetic number, because the mean of its divisors is an integer number (204460800).

Almost surely, 2^2137888221 is an apocalyptic number.

2137888221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2137888221 is a deficient number, since it is larger than the sum of its proper divisors (1133484579).

2137888221 is a wasteful number, since it uses less digits than its factorization.

2137888221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426208.

The product of its digits is 86016, while the sum is 42.

The square root of 2137888221 is about 46237.3033491357. The cubic root of 2137888221 is about 1288.2347147975.

Subtracting from 2137888221 its reverse (1228887312), we obtain a palindrome (909000909).

The spelling of 2137888221 in words is "two billion, one hundred thirty-seven million, eight hundred eighty-eight thousand, two hundred twenty-one".