21113242412 has 24 divisors (see below), whose sum is σ = 40075786800. Its totient is φ = 9693309440.

The previous prime is 21113242399. The next prime is 21113242417. The reversal of 21113242412 is 21424231112.

It is not an unprimeable number, because it can be changed into a prime (21113242417) 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, 3783662 + ... + 3789237.

It is an arithmetic number, because the mean of its divisors is an integer number (1669824450).

Almost surely, 2^21113242412 is an apocalyptic number.

It is an amenable number.

21113242412 is a deficient number, since it is larger than the sum of its proper divisors (18962544388).

21113242412 is a wasteful number, since it uses less digits than its factorization.

21113242412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7572961 (or 7572959 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 21113242412 its reverse (21424231112), we get a palindrome (42537473524).

The spelling of 21113242412 in words is "twenty-one billion, one hundred thirteen million, two hundred forty-two thousand, four hundred twelve".