21420230312 has 32 divisors (see below), whose sum is σ = 43773518880. Its totient is φ = 9767144640.

The previous prime is 21420230311. The next prime is 21420230341. The reversal of 21420230312 is 21303202412.

It is not an unprimeable number, because it can be changed into a prime (21420230311) 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, 1232114 + ... + 1249377.

It is an arithmetic number, because the mean of its divisors is an integer number (1367922465).

Almost surely, 2^21420230312 is an apocalyptic number.

It is an amenable number.

21420230312 is an abundant number, since it is smaller than the sum of its proper divisors (22353288568).

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

21420230312 is a wasteful number, since it uses less digits than its factorization.

21420230312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481593 (or 2481589 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21420230312 its reverse (21303202412), we get a palindrome (42723432724).

The spelling of 21420230312 in words is "twenty-one billion, four hundred twenty million, two hundred thirty thousand, three hundred twelve".