222012645 has 16 divisors (see below), whose sum is σ = 358739712. Its totient is φ = 117233600.

The previous prime is 222012619. The next prime is 222012649. The reversal of 222012645 is 546210222.

It is a happy number.

It is not a de Polignac number, because 222012645 - 2⁷ = 222012517 is a prime.

It is a super-2 number, since 2×222012645² = 98579229079792050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222012649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71757 + ... + 74786.

It is an arithmetic number, because the mean of its divisors is an integer number (22421232).

Almost surely, 2^222012645 is an apocalyptic number.

It is an amenable number.

222012645 is a deficient number, since it is larger than the sum of its proper divisors (136727067).

222012645 is a wasteful number, since it uses less digits than its factorization.

222012645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146652.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 222012645 is about 14900.0887581249. The cubic root of 222012645 is about 605.5163908433.

Adding to 222012645 its reverse (546210222), we get a palindrome (768222867).

The spelling of 222012645 in words is "two hundred twenty-two million, twelve thousand, six hundred forty-five".