21412135444 has 36 divisors (see below), whose sum is σ = 43688457120. Its totient is φ = 9155689200.

The previous prime is 21412135417. The next prime is 21412135469. The reversal of 21412135444 is 44453121412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38382 + ... + 210469.

Almost surely, 2^21412135444 is an apocalyptic number.

It is an amenable number.

21412135444 is an abundant number, since it is smaller than the sum of its proper divisors (22276321676).

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

21412135444 is a wasteful number, since it uses less digits than its factorization.

21412135444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249308 (or 249299 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

Adding to 21412135444 its reverse (44453121412), we get a palindrome (65865256856).

The spelling of 21412135444 in words is "twenty-one billion, four hundred twelve million, one hundred thirty-five thousand, four hundred forty-four".