21113220412 has 6 divisors (see below), whose sum is σ = 36948135728. Its totient is φ = 10556610204.

The previous prime is 21113220391. The next prime is 21113220449. The reversal of 21113220412 is 21402231112.

It is a self number, because there is not a number n which added to its sum of digits gives 21113220412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639152548 + ... + 2639152555.

Almost surely, 2^21113220412 is an apocalyptic number.

It is an amenable number.

21113220412 is a deficient number, since it is larger than the sum of its proper divisors (15834915316).

21113220412 is a wasteful number, since it uses less digits than its factorization.

21113220412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278305107 (or 5278305105 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21113220412 its reverse (21402231112), we get a palindrome (42515451524).

The spelling of 21113220412 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty thousand, four hundred twelve".