21792198121 has 8 divisors (see below), whose sum is σ = 22130825184. Its totient is φ = 21456070560.

The previous prime is 21792198101. The next prime is 21792198133. The reversal of 21792198121 is 12189129712.

It is a happy number.

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 21792198121 - 2²⁹ = 21255327209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21792198101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607300 + ... + 642181.

It is an arithmetic number, because the mean of its divisors is an integer number (2766353148).

Almost surely, 2^21792198121 is an apocalyptic number.

It is an amenable number.

21792198121 is a deficient number, since it is larger than the sum of its proper divisors (338627063).

21792198121 is a wasteful number, since it uses less digits than its factorization.

21792198121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249751.

The product of its digits is 36288, while the sum is 43.

The spelling of 21792198121 in words is "twenty-one billion, seven hundred ninety-two million, one hundred ninety-eight thousand, one hundred twenty-one".