21320430012 has 96 divisors (see below), whose sum is σ = 63471511040. Its totient is φ = 6062636160.

The previous prime is 21320429993. The next prime is 21320430023. The reversal of 21320430012 is 21003402312.

21320430012 is a `hidden beast` number, since 213 + 20 + 430 + 0 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 92688 + ... + 226344.

Almost surely, 2^21320430012 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 21320430012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31735755520).

21320430012 is an abundant number, since it is smaller than the sum of its proper divisors (42151081028).

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

21320430012 is a wasteful number, since it uses less digits than its factorization.

21320430012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133888 (or 133880 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21320430012 its reverse (21003402312), we get a palindrome (42323832324).

The spelling of 21320430012 in words is "twenty-one billion, three hundred twenty million, four hundred thirty thousand, twelve".