21424332412 has 48 divisors (see below), whose sum is σ = 43160685568. Its totient is φ = 9115104960.

The previous prime is 21424332409. The next prime is 21424332443. The reversal of 21424332412 is 21423342412.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9366733 + ... + 9369019.

Almost surely, 2^21424332412 is an apocalyptic number.

It is an amenable number.

21424332412 is an abundant number, since it is smaller than the sum of its proper divisors (21736353156).

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

21424332412 is a wasteful number, since it uses less digits than its factorization.

21424332412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586 (or 4584 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 21424332412 its reverse (21423342412), we get a palindrome (42847674824).

The spelling of 21424332412 in words is "twenty-one billion, four hundred twenty-four million, three hundred thirty-two thousand, four hundred twelve".