220021212 has 12 divisors (see below), whose sum is σ = 513382856. Its totient is φ = 73340400.

The previous prime is 220021183. The next prime is 220021253. The reversal of 220021212 is 212120022.

220021212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 18335101 = 220021212 / (2 + 2 + 0 + 0 + 2 + 1 + 2 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9167539 + ... + 9167562.

Almost surely, 2^220021212 is an apocalyptic number.

It is an amenable number.

220021212 is an abundant number, since it is smaller than the sum of its proper divisors (293361644).

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

220021212 is a wasteful number, since it uses less digits than its factorization.

220021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18335108 (or 18335106 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 220021212 is about 14833.1120133302. The cubic root of 220021212 is about 603.7004750001.

Adding to 220021212 its reverse (212120022), we get a palindrome (432141234).

The spelling of 220021212 in words is "two hundred twenty million, twenty-one thousand, two hundred twelve".