102021211212121 has 4 divisors (see below), whose sum is σ = 104191875280512. Its totient is φ = 99850547143732.

The previous prime is 102021211212101. The next prime is 102021211212131. The reversal of 102021211212121 is 121212112120201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102021211212121 - 2³¹ = 102019063728473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102021211212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085332034125 + ... + 1085332034218.

It is an arithmetic number, because the mean of its divisors is an integer number (26047968820128).

Almost surely, 2^{102021211212121} is an apocalyptic number.

It is an amenable number.

102021211212121 is a deficient number, since it is larger than the sum of its proper divisors (2170664068391).

102021211212121 is an equidigital number, since it uses as much as digits as its factorization.

102021211212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170664068390.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 102021211212121 its reverse (121212112120201), we get a palindrome (223233323332322).

The spelling of 102021211212121 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".