2191610094920 has 32 divisors (see below), whose sum is σ = 4931407855800. Its totient is φ = 876593346048.

The previous prime is 2191610094907. The next prime is 2191610094931. The reversal of 2191610094920 is 294900161912.

It can be written as a sum of positive squares in 4 ways, for example, as 2101380748996 + 90229345924 = 1449614^2 + 300382^2 .

It is a super-4 number, since 4×2191610094920⁴ (a number of 50 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879869 + ... + 2270988.

Almost surely, 2^{2191610094920} is an apocalyptic number.

2191610094920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191610094920 is an abundant number, since it is smaller than the sum of its proper divisors (2739797760880).

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

2191610094920 is a wasteful number, since it uses less digits than its factorization.

2191610094920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168257 (or 3168253 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 2191610094920 in words is "two trillion, one hundred ninety-one billion, six hundred ten million, ninety-four thousand, nine hundred twenty".