11122021221 has 8 divisors (see below), whose sum is σ = 15109161120. Its totient is φ = 7274781072.

The previous prime is 11122021213. The next prime is 11122021247. The reversal of 11122021221 is 12212022111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11122021221 - 2³ = 11122021213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11122021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122021291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34974751 + ... + 34975068.

It is an arithmetic number, because the mean of its divisors is an integer number (1888645140).

Almost surely, 2^11122021221 is an apocalyptic number.

It is an amenable number.

11122021221 is a deficient number, since it is larger than the sum of its proper divisors (3987139899).

11122021221 is an equidigital number, since it uses as much as digits as its factorization.

11122021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69949875.

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

Adding to 11122021221 its reverse (12212022111), we get a palindrome (23334043332).

The spelling of 11122021221 in words is "eleven billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".