102102210102021 has 4 divisors (see below), whose sum is σ = 136136280136032. Its totient is φ = 68068140068012.

The previous prime is 102102210101873. The next prime is 102102210102043. The reversal of 102102210102021 is 120201012201201.

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 102102210102021 - 2²⁷ = 102102075884293 is a prime.

It is a super-2 number, since 2×102102210102021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102102210102521) 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, 17017035017001 + ... + 17017035017006.

It is an arithmetic number, because the mean of its divisors is an integer number (34034070034008).

Almost surely, 2^{102102210102021} is an apocalyptic number.

It is an amenable number.

102102210102021 is a deficient number, since it is larger than the sum of its proper divisors (34034070034011).

102102210102021 is an equidigital number, since it uses as much as digits as its factorization.

102102210102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34034070034010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 102102210102021 its reverse (120201012201201), we get a palindrome (222303222303222).

The spelling of 102102210102021 in words is "one hundred two trillion, one hundred two billion, two hundred ten million, one hundred two thousand, twenty-one".