21312303430 has 16 divisors (see below), whose sum is σ = 41849614224. Its totient is φ = 7749928480.

The previous prime is 21312303349. The next prime is 21312303431. The reversal of 21312303430 is 3430321312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312303431) 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, 96873997 + ... + 96874216.

It is an arithmetic number, because the mean of its divisors is an integer number (2615600889).

Almost surely, 2^21312303430 is an apocalyptic number.

21312303430 is a deficient number, since it is larger than the sum of its proper divisors (20537310794).

21312303430 is a wasteful number, since it uses less digits than its factorization.

21312303430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193748231.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21312303430 its reverse (3430321312), we get a palindrome (24742624742).

The spelling of 21312303430 in words is "twenty-one billion, three hundred twelve million, three hundred three thousand, four hundred thirty".