21103320412 has 24 divisors (see below), whose sum is σ = 37840989312. Its totient is φ = 10291737600.

The previous prime is 21103320383. The next prime is 21103320449. The reversal of 21103320412 is 21402330112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103320412.

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, 757612 + ... + 784972.

It is an arithmetic number, because the mean of its divisors is an integer number (1576707888).

Almost surely, 2^21103320412 is an apocalyptic number.

It is an amenable number.

21103320412 is a deficient number, since it is larger than the sum of its proper divisors (16737668900).

21103320412 is a wasteful number, since it uses less digits than its factorization.

21103320412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32109 (or 32107 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21103320412 its reverse (21402330112), we get a palindrome (42505650524).

The spelling of 21103320412 in words is "twenty-one billion, one hundred three million, three hundred twenty thousand, four hundred twelve".