11222222001221 has 16 divisors (see below), whose sum is σ = 13991423631360. Its totient is φ = 8744537375280.

The previous prime is 11222222001127. The next prime is 11222222001251. The reversal of 11222222001221 is 12210022222211.

It is not a de Polignac number, because 11222222001221 - 2²⁶ = 11222154892357 is a prime.

It is a super-2 number, since 2×11222222001221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11222222001193 and 11222222001202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222222001251) 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, 17876300 + ... + 18493418.

It is an arithmetic number, because the mean of its divisors is an integer number (874463976960).

Almost surely, 2^{11222222001221} is an apocalyptic number.

11222222001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11222222001221 is a deficient number, since it is larger than the sum of its proper divisors (2769201630139).

11222222001221 is a wasteful number, since it uses less digits than its factorization.

11222222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853304.

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

Adding to 11222222001221 its reverse (12210022222211), we get a palindrome (23432244223432).

The spelling of 11222222001221 in words is "eleven trillion, two hundred twenty-two billion, two hundred twenty-two million, one thousand, two hundred twenty-one".