102102211102021 has 4 divisors (see below), whose sum is σ = 109956227340652. Its totient is φ = 94248194863392.

The previous prime is 102102211102009. The next prime is 102102211102027. The reversal of 102102211102021 is 120201112201201.

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 5300520825796 + 96801690276225 = 2302286^2 + 9838785^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102211102021 - 2²⁷ = 102102076884293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102102211101986 and 102102211102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102102211102027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3927008119296 + ... + 3927008119321.

It is an arithmetic number, because the mean of its divisors is an integer number (27489056835163).

Almost surely, 2^{102102211102021} is an apocalyptic number.

It is an amenable number.

102102211102021 is a deficient number, since it is larger than the sum of its proper divisors (7854016238631).

102102211102021 is an equidigital number, since it uses as much as digits as its factorization.

102102211102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7854016238630.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 102102211102021 its reverse (120201112201201), we get a palindrome (222303323303222).

The spelling of 102102211102021 in words is "one hundred two trillion, one hundred two billion, two hundred eleven million, one hundred two thousand, twenty-one".