102121011102221 has 4 divisors (see below), whose sum is σ = 102518369122332. Its totient is φ = 101723653082112.

The previous prime is 102121011102211. The next prime is 102121011102277. The reversal of 102121011102221 is 122201110121201.

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 78464412024196 + 23656599078025 = 8858014^2 + 4863805^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121011102221 - 2²⁶ = 102120943993357 is a prime.

It is a super-2 number, since 2×102121011102221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102121011102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121011102211) 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, 198679009670 + ... + 198679010183.

It is an arithmetic number, because the mean of its divisors is an integer number (25629592280583).

Almost surely, 2^{102121011102221} is an apocalyptic number.

It is an amenable number.

102121011102221 is a deficient number, since it is larger than the sum of its proper divisors (397358020111).

102121011102221 is an equidigital number, since it uses as much as digits as its factorization.

102121011102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397358020110.

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

Adding to 102121011102221 its reverse (122201110121201), we get a palindrome (224322121223422).

The spelling of 102121011102221 in words is "one hundred two trillion, one hundred twenty-one billion, eleven million, one hundred two thousand, two hundred twenty-one".