21113245412 has 24 divisors (see below), whose sum is σ = 42301525056. Its totient is φ = 9032455008.

The previous prime is 21113245411. The next prime is 21113245441. The reversal of 21113245412 is 21454231112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21113245411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653903 + ... + 685430.

It is an arithmetic number, because the mean of its divisors is an integer number (1762563544).

Almost surely, 2^21113245412 is an apocalyptic number.

It is an amenable number.

21113245412 is an abundant number, since it is smaller than the sum of its proper divisors (21188279644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113245412 is a wasteful number, since it uses less digits than its factorization.

21113245412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339907 (or 1339905 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

Adding to 21113245412 its reverse (21454231112), we get a palindrome (42567476524).

The spelling of 21113245412 in words is "twenty-one billion, one hundred thirteen million, two hundred forty-five thousand, four hundred twelve".