20312998121 has 8 divisors (see below), whose sum is σ = 21883297800. Its totient is φ = 18743807232.

The previous prime is 20312998007. The next prime is 20312998141. The reversal of 20312998121 is 12189921302.

It can be written as a sum of positive squares in 4 ways, for example, as 583705600 + 19729292521 = 24160^2 + 140461^2 .

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 20312998121 - 2¹⁸ = 20312735977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20312998141) 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, 238946 + ... + 312603.

It is an arithmetic number, because the mean of its divisors is an integer number (2735412225).

Almost surely, 2^20312998121 is an apocalyptic number.

It is an amenable number.

20312998121 is a deficient number, since it is larger than the sum of its proper divisors (1570299679).

20312998121 is a wasteful number, since it uses less digits than its factorization.

20312998121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554395.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 20312998121 in words is "twenty billion, three hundred twelve million, nine hundred ninety-eight thousand, one hundred twenty-one".