1122222220221 has 4 divisors (see below), whose sum is σ = 1496296293632. Its totient is φ = 748148146812.

The previous prime is 1122222220219. The next prime is 1122222220237. The reversal of 1122222220221 is 1220222222211.

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 not a de Polignac number, because 1122222220221 - 2¹ = 1122222220219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122222220291) 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, 187037036701 + ... + 187037036706.

It is an arithmetic number, because the mean of its divisors is an integer number (374074073408).

Almost surely, 2^{1122222220221} is an apocalyptic number.

It is an amenable number.

1122222220221 is a deficient number, since it is larger than the sum of its proper divisors (374074073411).

1122222220221 is an equidigital number, since it uses as much as digits as its factorization.

1122222220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374074073410.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1122222220221 its reverse (1220222222211), we get a palindrome (2342444442432).

The spelling of 1122222220221 in words is "one trillion, one hundred twenty-two billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".