21492312121 has 8 divisors (see below), whose sum is σ = 25354985984. Its totient is φ = 17827724160.

The previous prime is 21492312071. The next prime is 21492312133. The reversal of 21492312121 is 12121329412.

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 21492312121 - 2³³ = 12902377529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21492312121.

It is not an unprimeable number, because it can be changed into a prime (21492312151) 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, 49521240 + ... + 49521673.

It is an arithmetic number, because the mean of its divisors is an integer number (3169373248).

Almost surely, 2^21492312121 is an apocalyptic number.

It is an amenable number.

21492312121 is a deficient number, since it is larger than the sum of its proper divisors (3862673863).

21492312121 is an equidigital number, since it uses as much as digits as its factorization.

21492312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99042951.

The product of its digits is 1728, while the sum is 28.

The spelling of 21492312121 in words is "twenty-one billion, four hundred ninety-two million, three hundred twelve thousand, one hundred twenty-one".