221020222212 has 48 divisors (see below), whose sum is σ = 576665214720. Its totient is φ = 73204144416.

The previous prime is 221020222211. The next prime is 221020222223. The reversal of 221020222212 is 212222020122.

221020222212 is a `hidden beast` number, since 2 + 210 + 20 + 222 + 212 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (221020222211) 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, 6500508 + ... + 6534419.

It is an arithmetic number, because the mean of its divisors is an integer number (12013858640).

Almost surely, 2^221020222212 is an apocalyptic number.

It is an amenable number.

221020222212 is an abundant number, since it is smaller than the sum of its proper divisors (355644992508).

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

221020222212 is a wasteful number, since it uses less digits than its factorization.

221020222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13035097 (or 13035089 counting only the distinct ones).

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

Adding to 221020222212 its reverse (212222020122), we get a palindrome (433242242334).

The spelling of 221020222212 in words is "two hundred twenty-one billion, twenty million, two hundred twenty-two thousand, two hundred twelve".