2171930045400 has 72 divisors (see below), whose sum is σ = 7294065075180. Its totient is φ = 579181344960.

The previous prime is 2171930045357. The next prime is 2171930045437. The reversal of 2171930045400 is 45400391712.

2171930045400 is a `hidden beast` number, since 2 + 17 + 193 + 0 + 0 + 454 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×2171930045400² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 603312102 + ... + 603315701.

Almost surely, 2^{2171930045400} is an apocalyptic number.

2171930045400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171930045400 is an abundant number, since it is smaller than the sum of its proper divisors (5122135029780).

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

2171930045400 is a wasteful number, since it uses less digits than its factorization.

2171930045400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206627825 (or 1206627813 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 2171930045400 in words is "two trillion, one hundred seventy-one billion, nine hundred thirty million, forty-five thousand, four hundred".