10122222222221 has 4 divisors (see below), whose sum is σ = 10448745519744. Its totient is φ = 9795698924700.

The previous prime is 10122222222199. The next prime is 10122222222223. The reversal of 10122222222221 is 12222222222101.

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 10122222222221 - 2²² = 10122218027917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10122222222223) 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, 163261648715 + ... + 163261648776.

It is an arithmetic number, because the mean of its divisors is an integer number (2612186379936).

Almost surely, 2^{10122222222221} is an apocalyptic number.

It is an amenable number.

10122222222221 is a deficient number, since it is larger than the sum of its proper divisors (326523297523).

10122222222221 is an equidigital number, since it uses as much as digits as its factorization.

10122222222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326523297522.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 10122222222221 its reverse (12222222222101), we get a palindrome (22344444444322).

The spelling of 10122222222221 in words is "ten trillion, one hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".