102021211121021 has 4 divisors (see below), whose sum is σ = 102024956282844. Its totient is φ = 102017465959200.

The previous prime is 102021211120957. The next prime is 102021211121023. The reversal of 102021211121021 is 120121112120201.

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 62720285908996 + 39300925212025 = 7919614^2 + 6269045^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021211121021 - 2⁶ = 102021211120957 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 (102021211121023) 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, 1872540050 + ... + 1872594531.

It is an arithmetic number, because the mean of its divisors is an integer number (25506239070711).

Almost surely, 2^{102021211121021} is an apocalyptic number.

It is an amenable number.

102021211121021 is a deficient number, since it is larger than the sum of its proper divisors (3745161823).

102021211121021 is an equidigital number, since it uses as much as digits as its factorization.

102021211121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745161822.

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

Adding to 102021211121021 its reverse (120121112120201), we get a palindrome (222142323241222).

The spelling of 102021211121021 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, twenty-one".