102102220211021 has 4 divisors (see below), whose sum is σ = 102131721000444. Its totient is φ = 102072719421600.

The previous prime is 102102220211011. The next prime is 102102220211023. The reversal of 102102220211021 is 120112022201201.

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 17159361772996 + 84942858438025 = 4142386^2 + 9216445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102102220211021 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 (102102220211023) 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, 14750389520 + ... + 14750396441.

It is an arithmetic number, because the mean of its divisors is an integer number (25532930250111).

Almost surely, 2^{102102220211021} is an apocalyptic number.

It is an amenable number.

102102220211021 is a deficient number, since it is larger than the sum of its proper divisors (29500789423).

102102220211021 is an equidigital number, since it uses as much as digits as its factorization.

102102220211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29500789422.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102102220211021 its reverse (120112022201201), we get a palindrome (222214242412222).

The spelling of 102102220211021 in words is "one hundred two trillion, one hundred two billion, two hundred twenty million, two hundred eleven thousand, twenty-one".