21222200012 has 18 divisors (see below), whose sum is σ = 40215442428. Its totient is φ = 9794861232.

The previous prime is 21222200011. The next prime is 21222200023. The reversal of 21222200012 is 21000222212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222200012.

It is not an unprimeable number, because it can be changed into a prime (21222200011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15696218 + ... + 15697569.

It is an arithmetic number, because the mean of its divisors is an integer number (2234191246).

Almost surely, 2^21222200012 is an apocalyptic number.

It is an amenable number.

21222200012 is a deficient number, since it is larger than the sum of its proper divisors (18993242416).

21222200012 is a wasteful number, since it uses less digits than its factorization.

21222200012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31393817 (or 31393802 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21222200012 its reverse (21000222212), we get a palindrome (42222422224).

The spelling of 21222200012 in words is "twenty-one billion, two hundred twenty-two million, two hundred thousand, twelve".