20231220110021 has 4 divisors (see below), whose sum is σ = 20231233225344. Its totient is φ = 20231206994700.

The previous prime is 20231220109967. The next prime is 20231220110027. The reversal of 20231220110021 is 12001102213202.

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.

It is a cyclic number.

It is not a de Polignac number, because 20231220110021 - 2¹⁸ = 20231219847877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231220110027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3879125 + ... + 7450506.

It is an arithmetic number, because the mean of its divisors is an integer number (5057808306336).

Almost surely, 2^{20231220110021} is an apocalyptic number.

It is an amenable number.

20231220110021 is a deficient number, since it is larger than the sum of its proper divisors (13115323).

20231220110021 is a wasteful number, since it uses less digits than its factorization.

20231220110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13115322.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20231220110021 its reverse (12001102213202), we get a palindrome (32232322323223).

The spelling of 20231220110021 in words is "twenty trillion, two hundred thirty-one billion, two hundred twenty million, one hundred ten thousand, twenty-one".