22111012001221 has 16 divisors (see below), whose sum is σ = 25976707626240. Its totient is φ = 18554599609920.

The previous prime is 22111012001179. The next prime is 22111012001251. The reversal of 22111012001221 is 12210021011122.

It is not a de Polignac number, because 22111012001221 - 2²⁵ = 22110978446789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22111012001195 and 22111012001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111012001251) 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, 47101300 + ... + 47568418.

It is an arithmetic number, because the mean of its divisors is an integer number (1623544226640).

Almost surely, 2^{22111012001221} is an apocalyptic number.

It is an amenable number.

22111012001221 is a deficient number, since it is larger than the sum of its proper divisors (3865695625019).

22111012001221 is a wasteful number, since it uses less digits than its factorization.

22111012001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798156.

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

Adding to 22111012001221 its reverse (12210021011122), we get a palindrome (34321033012343).

Subtracting from 22111012001221 its reverse (12210021011122), we obtain a palindrome (9900990990099).

The spelling of 22111012001221 in words is "twenty-two trillion, one hundred eleven billion, twelve million, one thousand, two hundred twenty-one".