18220400222 has 32 divisors (see below), whose sum is σ = 28887243840. Its totient is φ = 8601880320.

The previous prime is 18220400221. The next prime is 18220400239. The reversal of 18220400222 is 22200402281.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220400221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2702768 + ... + 2709500.

It is an arithmetic number, because the mean of its divisors is an integer number (902726370).

Almost surely, 2^18220400222 is an apocalyptic number.

18220400222 is a deficient number, since it is larger than the sum of its proper divisors (10666843618).

18220400222 is a wasteful number, since it uses less digits than its factorization.

18220400222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7508.

The product of its (nonzero) digits is 1024, while the sum is 23.

The spelling of 18220400222 in words is "eighteen billion, two hundred twenty million, four hundred thousand, two hundred twenty-two".