11121202221 has 16 divisors (see below), whose sum is σ = 15443538048. Its totient is φ = 7112145600.

The previous prime is 11121202217. The next prime is 11121202249. The reversal of 11121202221 is 12220212111.

It is not a de Polignac number, because 11121202221 - 2² = 11121202217 is a prime.

It is a super-2 number, since 2×11121202221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11121202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121202201) 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, 697690 + ... + 713451.

It is an arithmetic number, because the mean of its divisors is an integer number (965221128).

Almost surely, 2^11121202221 is an apocalyptic number.

It is an amenable number.

11121202221 is a deficient number, since it is larger than the sum of its proper divisors (4322335827).

11121202221 is a wasteful number, since it uses less digits than its factorization.

11121202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411252.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11121202221 its reverse (12220212111), we get a palindrome (23341414332).

The spelling of 11121202221 in words is "eleven billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".