22221985 has 4 divisors (see below), whose sum is σ = 26666388. Its totient is φ = 17777584.

The previous prime is 22221977. The next prime is 22222049. The reversal of 22221985 is 58912222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58912222 = 2 ⋅29456111.

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 16418704 = 2409^2 + 4052^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221985 - 2³ = 22221977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2222194 + ... + 2222203.

It is an arithmetic number, because the mean of its divisors is an integer number (6666597).

Almost surely, 2^22221985 is an apocalyptic number.

It is an amenable number.

22221985 is a deficient number, since it is larger than the sum of its proper divisors (4444403).

22221985 is an equidigital number, since it uses as much as digits as its factorization.

22221985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444402.

The product of its digits is 5760, while the sum is 31.

The square root of 22221985 is about 4714.0200466269. The cubic root of 22221985 is about 281.1432213588.

The spelling of 22221985 in words is "twenty-two million, two hundred twenty-one thousand, nine hundred eighty-five".