2157684712 has 8 divisors (see below), whose sum is σ = 4045658850. Its totient is φ = 1078842352.

The previous prime is 2157684701. The next prime is 2157684721. The reversal of 2157684712 is 2174867512.

It can be written as a sum of positive squares in only one way, i.e., 1929493476 + 228191236 = 43926^2 + 15106^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134855287 + ... + 134855302.

Almost surely, 2^2157684712 is an apocalyptic number.

It is an amenable number.

2157684712 is a deficient number, since it is larger than the sum of its proper divisors (1887974138).

2157684712 is a wasteful number, since it uses less digits than its factorization.

2157684712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269710595 (or 269710591 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 2157684712 is about 46450.8849431311. The cubic root of 2157684712 is about 1292.1987843806.

The spelling of 2157684712 in words is "two billion, one hundred fifty-seven million, six hundred eighty-four thousand, seven hundred twelve".