22212518 has 4 divisors (see below), whose sum is σ = 33318780. Its totient is φ = 11106258.

The previous prime is 22212439. The next prime is 22212527. The reversal of 22212518 is 81521222.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22212493 and 22212502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5553128 + ... + 5553131.

It is an arithmetic number, because the mean of its divisors is an integer number (8329695).

Almost surely, 2^22212518 is an apocalyptic number.

22212518 is a deficient number, since it is larger than the sum of its proper divisors (11106262).

22212518 is a wasteful number, since it uses less digits than its factorization.

22212518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106261.

The product of its digits is 640, while the sum is 23.

The square root of 22212518 is about 4713.0158073149. The cubic root of 22212518 is about 281.1032915187.

The spelling of 22212518 in words is "twenty-two million, two hundred twelve thousand, five hundred eighteen".