102120220222021 has 4 divisors (see below), whose sum is σ = 102120256102572. Its totient is φ = 102120184341472.

The previous prime is 102120220221997. The next prime is 102120220222093. The reversal of 102120220222021 is 120222022021201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20268139060225 + 81852081161796 = 4502015^2 + 9047214^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120220222021 - 2⁵ = 102120220221989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102120220222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120220232021) 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, 13264966 + ... + 19498711.

It is an arithmetic number, because the mean of its divisors is an integer number (25530064025643).

Almost surely, 2^{102120220222021} is an apocalyptic number.

It is an amenable number.

102120220222021 is a deficient number, since it is larger than the sum of its proper divisors (35880551).

102120220222021 is an equidigital number, since it uses as much as digits as its factorization.

102120220222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35880550.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 102120220222021 its reverse (120222022021201), we get a palindrome (222342242243222).

The spelling of 102120220222021 in words is "one hundred two trillion, one hundred twenty billion, two hundred twenty million, two hundred twenty-two thousand, twenty-one".