2157211794 has 8 divisors (see below), whose sum is σ = 4314423600. Its totient is φ = 719070596.

The previous prime is 2157211783. The next prime is 2157211799. The reversal of 2157211794 is 4971127512.

It is a sphenic number, since it is the product of 3 distinct primes.

2157211794 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2157211799) 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, 179767644 + ... + 179767655.

It is an arithmetic number, because the mean of its divisors is an integer number (539302950).

Almost surely, 2^2157211794 is an apocalyptic number.

2157211794 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2157211794 is a wasteful number, since it uses less digits than its factorization.

2157211794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359535304.

The product of its digits is 35280, while the sum is 39.

The square root of 2157211794 is about 46445.7941475867. The cubic root of 2157211794 is about 1292.1043701051.

The spelling of 2157211794 in words is "two billion, one hundred fifty-seven million, two hundred eleven thousand, seven hundred ninety-four".