2157219556 has 12 divisors (see below), whose sum is σ = 3997201068. Its totient is φ = 1015162112.

The previous prime is 2157219527. The next prime is 2157219557. The reversal of 2157219556 is 6559127512.

It can be written as a sum of positive squares in 2 ways, for example, as 1366485156 + 790734400 = 36966^2 + 28120^2 .

It is not an unprimeable number, because it can be changed into a prime (2157219557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15861841 + ... + 15861976.

It is an arithmetic number, because the mean of its divisors is an integer number (333100089).

Almost surely, 2^2157219556 is an apocalyptic number.

It is an amenable number.

2157219556 is a deficient number, since it is larger than the sum of its proper divisors (1839981512).

2157219556 is a wasteful number, since it uses less digits than its factorization.

2157219556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31723838 (or 31723836 counting only the distinct ones).

The product of its digits is 189000, while the sum is 43.

The square root of 2157219556 is about 46445.8777072842. The cubic root of 2157219556 is about 1292.1059198373.

The spelling of 2157219556 in words is "two billion, one hundred fifty-seven million, two hundred nineteen thousand, five hundred fifty-six".