20312102220121 has 4 divisors (see below), whose sum is σ = 20312113021200. Its totient is φ = 20312091419044.

The previous prime is 20312102220043. The next prime is 20312102220131. The reversal of 20312102220121 is 12102220121302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20312102220121 - 2⁹ = 20312102219609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312102220131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763011 + ... + 6613048.

It is an arithmetic number, because the mean of its divisors is an integer number (5078028255300).

Almost surely, 2^{20312102220121} is an apocalyptic number.

It is an amenable number.

20312102220121 is a deficient number, since it is larger than the sum of its proper divisors (10801079).

20312102220121 is an equidigital number, since it uses as much as digits as its factorization.

20312102220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10801078.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20312102220121 its reverse (12102220121302), we get a palindrome (32414322341423).

The spelling of 20312102220121 in words is "twenty trillion, three hundred twelve billion, one hundred two million, two hundred twenty thousand, one hundred twenty-one".