21977194018290 has 128 divisors (see below), whose sum is σ = 60322479501312. Its totient is φ = 5019845495040.

The previous prime is 21977194018289. The next prime is 21977194018309. The reversal of 21977194018290 is 9281049177912.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2438383824 + ... + 2438392836.

It is an arithmetic number, because the mean of its divisors is an integer number (471269371104).

Almost surely, 2^{21977194018290} is an apocalyptic number.

21977194018290 is an abundant number, since it is smaller than the sum of its proper divisors (38345285483022).

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

21977194018290 is a wasteful number, since it uses less digits than its factorization.

21977194018290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15864.

The product of its (nonzero) digits is 4572288, while the sum is 60.

The spelling of 21977194018290 in words is "twenty-one trillion, nine hundred seventy-seven billion, one hundred ninety-four million, eighteen thousand, two hundred ninety".