18213122 has 4 divisors (see below), whose sum is σ = 27319686. Its totient is φ = 9106560.

The previous prime is 18213119. The next prime is 18213149. The reversal of 18213122 is 22131281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22131281 = 557 ⋅39733.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 5900041 = 3509^2 + 2429^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18213094 and 18213103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4553279 + ... + 4553282.

Almost surely, 2^18213122 is an apocalyptic number.

18213122 is a deficient number, since it is larger than the sum of its proper divisors (9106564).

18213122 is an equidigital number, since it uses as much as digits as its factorization.

18213122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9106563.

The product of its digits is 192, while the sum is 20.

The square root of 18213122 is about 4267.6834465551. The cubic root of 18213122 is about 263.1044128494.

The spelling of 18213122 in words is "eighteen million, two hundred thirteen thousand, one hundred twenty-two".