222051421 has 4 divisors (see below), whose sum is σ = 224088700. Its totient is φ = 220014144.

The previous prime is 222051413. The next prime is 222051437. The reversal of 222051421 is 124150222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121771225 + 100280196 = 11035^2 + 10014^2 .

It is a cyclic number.

It is not a de Polignac number, because 222051421 - 2³ = 222051413 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 (222051451) 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, 1018476 + ... + 1018693.

It is an arithmetic number, because the mean of its divisors is an integer number (56022175).

Almost surely, 2^222051421 is an apocalyptic number.

It is an amenable number.

222051421 is a deficient number, since it is larger than the sum of its proper divisors (2037279).

222051421 is a wasteful number, since it uses less digits than its factorization.

222051421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037278.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 222051421 is about 14901.3899016166. The cubic root of 222051421 is about 605.5516412931.

The spelling of 222051421 in words is "two hundred twenty-two million, fifty-one thousand, four hundred twenty-one".