22121145 has 12 divisors (see below), whose sum is σ = 38343396. Its totient is φ = 11797920.

The previous prime is 22121137. The next prime is 22121159. The reversal of 22121145 is 54112122.

It can be written as a sum of positive squares in 2 ways, for example, as 3250809 + 18870336 = 1803^2 + 4344^2 .

It is not a de Polignac number, because 22121145 - 2³ = 22121137 is a prime.

It is a super-2 number, since 2×22121145² = 978690112222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245746 + ... + 245835.

It is an arithmetic number, because the mean of its divisors is an integer number (3195283).

Almost surely, 2^22121145 is an apocalyptic number.

It is an amenable number.

22121145 is a deficient number, since it is larger than the sum of its proper divisors (16222251).

22121145 is a wasteful number, since it uses less digits than its factorization.

22121145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491592 (or 491589 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 22121145 is about 4703.3121308287. The cubic root of 22121145 is about 280.7173146981.

Adding to 22121145 its reverse (54112122), we get a palindrome (76233267).

The spelling of 22121145 in words is "twenty-two million, one hundred twenty-one thousand, one hundred forty-five".