20312236121 has 16 divisors (see below), whose sum is σ = 21461630400. Its totient is φ = 19171012608.

The previous prime is 20312236093. The next prime is 20312236163. The reversal of 20312236121 is 12163221302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312236121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312536121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8958830 + ... + 8961096.

It is an arithmetic number, because the mean of its divisors is an integer number (1341351900).

Almost surely, 2^20312236121 is an apocalyptic number.

It is an amenable number.

20312236121 is a deficient number, since it is larger than the sum of its proper divisors (1149394279).

20312236121 is a wasteful number, since it uses less digits than its factorization.

20312236121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20312236121 its reverse (12163221302), we get a palindrome (32475457423).

The spelling of 20312236121 in words is "twenty billion, three hundred twelve million, two hundred thirty-six thousand, one hundred twenty-one".