220021221212 has 12 divisors (see below), whose sum is σ = 414655378536. Its totient is φ = 101548255920.

The previous prime is 220021221197. The next prime is 220021221239. The reversal of 220021221212 is 212122120022.

It is a happy number.

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, 2115588614 + ... + 2115588717.

It is an arithmetic number, because the mean of its divisors is an integer number (34554614878).

Almost surely, 2^220021221212 is an apocalyptic number.

It is an amenable number.

220021221212 is a deficient number, since it is larger than the sum of its proper divisors (194634157324).

220021221212 is a wasteful number, since it uses less digits than its factorization.

220021221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231177348 (or 4231177346 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 220021221212 its reverse (212122120022), we get a palindrome (432143341234).

The spelling of 220021221212 in words is "two hundred twenty billion, twenty-one million, two hundred twenty-one thousand, two hundred twelve".