21992190121 has 8 divisors (see below), whose sum is σ = 24576638688. Its totient is φ = 19505268000.

The previous prime is 21992190119. The next prime is 21992190161. The reversal of 21992190121 is 12109129912.

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

It is a cyclic number.

It is not a de Polignac number, because 21992190121 - 2¹ = 21992190119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21992190161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24381135 + ... + 24382036.

It is an arithmetic number, because the mean of its divisors is an integer number (3072079836).

Almost surely, 2^21992190121 is an apocalyptic number.

It is an amenable number.

21992190121 is a deficient number, since it is larger than the sum of its proper divisors (2584448567).

21992190121 is a wasteful number, since it uses less digits than its factorization.

21992190121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48763223.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 21992190121 in words is "twenty-one billion, nine hundred ninety-two million, one hundred ninety thousand, one hundred twenty-one".