222212201220 has 36 divisors (see below), whose sum is σ = 674043677580. Its totient is φ = 59256586944.

The previous prime is 222212201147. The next prime is 222212201293. The reversal of 222212201220 is 22102212222.

222212201220 is a `hidden beast` number, since 2 + 2 + 221 + 220 + 1 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (222212201147) and next prime (222212201293).

It can be written as a sum of positive squares in 2 ways, for example, as 53128406016 + 169083795204 = 230496^2 + 411198^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 222212201193 and 222212201202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617255935 + ... + 617256294.

Almost surely, 2^222212201220 is an apocalyptic number.

222212201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222212201220 is an abundant number, since it is smaller than the sum of its proper divisors (451831476360).

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

222212201220 is a wasteful number, since it uses less digits than its factorization.

222212201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234512244 (or 1234512239 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 222212201220 its reverse (22102212222), we get a palindrome (244314413442).

The spelling of 222212201220 in words is "two hundred twenty-two billion, two hundred twelve million, two hundred one thousand, two hundred twenty".