11222221220021 has 16 divisors (see below), whose sum is σ = 12866984486400. Its totient is φ = 9587858087808.

The previous prime is 11222221219981. The next prime is 11222221220027. The reversal of 11222221220021 is 12002212222211.

It is a de Polignac number, because none of the positive numbers 2^k-11222221220021 is a prime.

It is a super-2 number, since 2×11222221220021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222221219975 and 11222221220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222221220027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50696660 + ... + 50917538.

It is an arithmetic number, because the mean of its divisors is an integer number (804186530400).

Almost surely, 2^{11222221220021} is an apocalyptic number.

It is an amenable number.

11222221220021 is a deficient number, since it is larger than the sum of its proper divisors (1644763266379).

11222221220021 is a wasteful number, since it uses less digits than its factorization.

11222221220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244388.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 11222221220021 its reverse (12002212222211), we get a palindrome (23224433442232).

The spelling of 11222221220021 in words is "eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".