21220022212 has 24 divisors (see below), whose sum is σ = 37281081600. Its totient is φ = 10568323296.

The previous prime is 21220022209. The next prime is 21220022231. The reversal of 21220022212 is 21222002212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3183339 + ... + 3189997.

It is an arithmetic number, because the mean of its divisors is an integer number (1553378400).

Almost surely, 2^21220022212 is an apocalyptic number.

It is an amenable number.

21220022212 is a deficient number, since it is larger than the sum of its proper divisors (16061059388).

21220022212 is a wasteful number, since it uses less digits than its factorization.

21220022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9675 (or 9673 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220022212 its reverse (21222002212), we get a palindrome (42442024424).

The spelling of 21220022212 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred twelve".