102121110212021 has 4 divisors (see below), whose sum is σ = 102121580234700. Its totient is φ = 102120640189344.

The previous prime is 102121110211957. The next prime is 102121110212027. The reversal of 102121110212021 is 120212011121201.

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 10817619670225 + 91303490541796 = 3289015^2 + 9555286^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121110212021 - 2⁶ = 102121110211957 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 (102121110212027) 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, 234685286 + ... + 235120023.

It is an arithmetic number, because the mean of its divisors is an integer number (25530395058675).

Almost surely, 2^{102121110212021} is an apocalyptic number.

It is an amenable number.

102121110212021 is a deficient number, since it is larger than the sum of its proper divisors (470022679).

102121110212021 is an equidigital number, since it uses as much as digits as its factorization.

102121110212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470022678.

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

Adding to 102121110212021 its reverse (120212011121201), we get a palindrome (222333121333222).

The spelling of 102121110212021 in words is "one hundred two trillion, one hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, twenty-one".