20331022100021 has 4 divisors (see below), whose sum is σ = 20334417967392. Its totient is φ = 20327626232652.

The previous prime is 20331022100009. The next prime is 20331022100027. The reversal of 20331022100021 is 12000122013302.

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 20331022100021 - 2¹⁰ = 20331022098997 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 (20331022100027) 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, 1697924705 + ... + 1697936678.

It is an arithmetic number, because the mean of its divisors is an integer number (5083604491848).

Almost surely, 2^{20331022100021} is an apocalyptic number.

It is an amenable number.

20331022100021 is a deficient number, since it is larger than the sum of its proper divisors (3395867371).

20331022100021 is an equidigital number, since it uses as much as digits as its factorization.

20331022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395867370.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20331022100021 its reverse (12000122013302), we get a palindrome (32331144113323).

The spelling of 20331022100021 in words is "twenty trillion, three hundred thirty-one billion, twenty-two million, one hundred thousand, twenty-one".