11012122221 has 4 divisors (see below), whose sum is σ = 14682829632. Its totient is φ = 7341414812.

The previous prime is 11012122189. The next prime is 11012122241. The reversal of 11012122221 is 12222121011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12222121011 = 3 ⋅4074040337.

It is a cyclic number.

It is not a de Polignac number, because 11012122221 - 2⁵ = 11012122189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11012122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012122241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835353701 + ... + 1835353706.

It is an arithmetic number, because the mean of its divisors is an integer number (3670707408).

Almost surely, 2^11012122221 is an apocalyptic number.

It is an amenable number.

11012122221 is a deficient number, since it is larger than the sum of its proper divisors (3670707411).

11012122221 is an equidigital number, since it uses as much as digits as its factorization.

11012122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670707410.

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

Adding to 11012122221 its reverse (12222121011), we get a palindrome (23234243232).

The spelling of 11012122221 in words is "eleven billion, twelve million, one hundred twenty-two thousand, two hundred twenty-one".