222121202220 has 72 divisors (see below), whose sum is σ = 673889186880. Its totient is φ = 59221635840.

The previous prime is 222121202213. The next prime is 222121202231. The reversal of 222121202220 is 22202121222.

222121202220 is a `hidden beast` number, since 2 + 221 + 21 + 202 + 220 = 666.

It is a super-3 number, since 3×222121202220³ (a number of 35 digits) contains 333 as substring.

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 = 222121202193 and 222121202202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 915565 + ... + 1132475.

It is an arithmetic number, because the mean of its divisors is an integer number (9359572040).

Almost surely, 2^222121202220 is an apocalyptic number.

222121202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121202220 is an abundant number, since it is smaller than the sum of its proper divisors (451767984660).

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

222121202220 is a wasteful number, since it uses less digits than its factorization.

222121202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222615 (or 222610 counting only the distinct ones).

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

Adding to 222121202220 its reverse (22202121222), we get a palindrome (244323323442).

The spelling of 222121202220 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty".