20112221212 has 24 divisors (see below), whose sum is σ = 37408494816. Its totient is φ = 9428579328.

The previous prime is 20112221141. The next prime is 20112221231. The reversal of 20112221212 is 21212221102.

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 7 ways as a sum of consecutive naturals, for example, 544413 + ... + 580180.

It is an arithmetic number, because the mean of its divisors is an integer number (1558687284).

Almost surely, 2^20112221212 is an apocalyptic number.

It is an amenable number.

20112221212 is a deficient number, since it is larger than the sum of its proper divisors (17296273604).

20112221212 is a wasteful number, since it uses less digits than its factorization.

20112221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124877 (or 1124875 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20112221212 its reverse (21212221102), we get a palindrome (41324442314).

The spelling of 20112221212 in words is "twenty billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twelve".