11222101122221 has 4 divisors (see below), whose sum is σ = 12242292133344. Its totient is φ = 10201910111100.

The previous prime is 11222101122163. The next prime is 11222101122257. The reversal of 11222101122221 is 12222110122211.

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.

It is a cyclic number.

It is not a de Polignac number, because 11222101122221 - 2¹⁰ = 11222101121197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222101122193 and 11222101122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222101122121) 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, 510095505545 + ... + 510095505566.

It is an arithmetic number, because the mean of its divisors is an integer number (3060573033336).

Almost surely, 2^{11222101122221} is an apocalyptic number.

11222101122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11222101122221 is a deficient number, since it is larger than the sum of its proper divisors (1020191011123).

11222101122221 is a wasteful number, since it uses less digits than its factorization.

11222101122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020191011122.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11222101122221 its reverse (12222110122211), we get a palindrome (23444211244432).

The spelling of 11222101122221 in words is "eleven trillion, two hundred twenty-two billion, one hundred one million, one hundred twenty-two thousand, two hundred twenty-one".