22155442 has 4 divisors (see below), whose sum is σ = 33233166. Its totient is φ = 11077720.

The previous prime is 22155433. The next prime is 22155451. The reversal of 22155442 is 24455122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24455122 = 2 ⋅12227561.

It is an interprime number because it is at equal distance from previous prime (22155433) and next prime (22155451).

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 4084441 = 4251^2 + 2021^2 .

It is a super-2 number, since 2×22155442² = 981727220430728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5538859 + ... + 5538862.

Almost surely, 2^22155442 is an apocalyptic number.

22155442 is a deficient number, since it is larger than the sum of its proper divisors (11077724).

22155442 is a wasteful number, since it uses less digits than its factorization.

22155442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11077723.

The product of its digits is 3200, while the sum is 25.

The square root of 22155442 is about 4706.9567663194. The cubic root of 22155442 is about 280.8623160884.

The spelling of 22155442 in words is "twenty-two million, one hundred fifty-five thousand, four hundred forty-two".