222121200018 has 32 divisors (see below), whose sum is σ = 451808539200. Its totient is φ = 72779580416.

The previous prime is 222121200011. The next prime is 222121200023. The reversal of 222121200018 is 810002121222.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222121199967 and 222121200003.

It is not an unprimeable number, because it can be changed into a prime (222121200011) 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, 7450630 + ... + 7480382.

It is an arithmetic number, because the mean of its divisors is an integer number (14119016850).

Almost surely, 2^222121200018 is an apocalyptic number.

222121200018 is an abundant number, since it is smaller than the sum of its proper divisors (229687339182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222121200018 is a wasteful number, since it uses less digits than its factorization.

222121200018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50906.

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 222121200018 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred thousand, eighteen".