102220121111021 has 4 divisors (see below), whose sum is σ = 105744952873500. Its totient is φ = 98695289348544.

The previous prime is 102220121110967. The next prime is 102220121111039. The reversal of 102220121111021 is 120111121022201.

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 63302311875625 + 38917809235396 = 7956275^2 + 6238414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102220121111021 is a prime.

It is a super-2 number, since 2×102220121111021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102220121111821) 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, 1762415881196 + ... + 1762415881253.

It is an arithmetic number, because the mean of its divisors is an integer number (26436238218375).

Almost surely, 2^{102220121111021} is an apocalyptic number.

It is an amenable number.

102220121111021 is a deficient number, since it is larger than the sum of its proper divisors (3524831762479).

102220121111021 is an equidigital number, since it uses as much as digits as its factorization.

102220121111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524831762478.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 102220121111021 its reverse (120111121022201), we get a palindrome (222331242133222).

The spelling of 102220121111021 in words is "one hundred two trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".