21234560412 has 96 divisors (see below), whose sum is σ = 53742008320. Its totient is φ = 6486946560.

The previous prime is 21234560381. The next prime is 21234560437. The reversal of 21234560412 is 21406543212.

It is a self number, because there is not a number n which added to its sum of digits gives 21234560412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19863414 + ... + 19864482.

Almost surely, 2^21234560412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21234560412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26871004160).

21234560412 is an abundant number, since it is smaller than the sum of its proper divisors (32507447908).

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

21234560412 is a wasteful number, since it uses less digits than its factorization.

21234560412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 1881 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21234560412 in words is "twenty-one billion, two hundred thirty-four million, five hundred sixty thousand, four hundred twelve".