222021401 has 6 divisors (see below), whose sum is σ = 258269850. Its totient is φ = 190304016.

The previous prime is 222021391. The next prime is 222021407. The reversal of 222021401 is 104120222.

It can be written as a sum of positive squares in only one way, i.e., 131790400 + 90231001 = 11480^2 + 9499^2 .

It is not a de Polignac number, because 222021401 - 2²² = 217827097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (222021407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2265476 + ... + 2265573.

It is an arithmetic number, because the mean of its divisors is an integer number (43044975).

Almost surely, 2^222021401 is an apocalyptic number.

It is an amenable number.

222021401 is a deficient number, since it is larger than the sum of its proper divisors (36248449).

222021401 is an equidigital number, since it uses as much as digits as its factorization.

222021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531063 (or 4531056 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 222021401 is about 14900.3825789810. The cubic root of 222021401 is about 605.5243510984.

Adding to 222021401 its reverse (104120222), we get a palindrome (326141623).

The spelling of 222021401 in words is "two hundred twenty-two million, twenty-one thousand, four hundred one".