10102122221 has 4 divisors (see below), whose sum is σ = 10267730844. Its totient is φ = 9936513600.

The previous prime is 10102122209. The next prime is 10102122227. The reversal of 10102122221 is 12222120101.

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 1215289321 + 8886832900 = 34861^2 + 94270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10102122221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10102122196 and 10102122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10102122227) 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, 82804220 + ... + 82804341.

It is an arithmetic number, because the mean of its divisors is an integer number (2566932711).

Almost surely, 2^10102122221 is an apocalyptic number.

It is an amenable number.

10102122221 is a deficient number, since it is larger than the sum of its proper divisors (165608623).

10102122221 is an equidigital number, since it uses as much as digits as its factorization.

10102122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165608622.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10102122221 its reverse (12222120101), we get a palindrome (22324242322).

The spelling of 10102122221 in words is "ten billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-one".