220120102012021 has 4 divisors (see below), whose sum is σ = 220362792312832. Its totient is φ = 219877411711212.

The previous prime is 220120102011949. The next prime is 220120102012037. The reversal of 220120102012021 is 120210201021022.

It is a happy number.

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 220120102012021 - 2⁴⁷ = 79382613656693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220120102011986 and 220120102012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220120162012021) 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, 121345149045 + ... + 121345150858.

It is an arithmetic number, because the mean of its divisors is an integer number (55090698078208).

Almost surely, 2^{220120102012021} is an apocalyptic number.

It is an amenable number.

220120102012021 is a deficient number, since it is larger than the sum of its proper divisors (242690300811).

220120102012021 is an equidigital number, since it uses as much as digits as its factorization.

220120102012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242690300810.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220120102012021 its reverse (120210201021022), we get a palindrome (340330303033043).

Subtracting from 220120102012021 its reverse (120210201021022), we obtain a palindrome (99909900990999).

The spelling of 220120102012021 in words is "two hundred twenty trillion, one hundred twenty billion, one hundred two million, twelve thousand, twenty-one".