21223030312 has 16 divisors (see below), whose sum is σ = 43410744000. Its totient is φ = 9646831920.

The previous prime is 21223030303. The next prime is 21223030321. The reversal of 21223030312 is 21303032212.

It is an interprime number because it is at equal distance from previous prime (21223030303) and next prime (21223030321).

It is a self number, because there is not a number n which added to its sum of digits gives 21223030312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120585312 + ... + 120585487.

It is an arithmetic number, because the mean of its divisors is an integer number (2713171500).

Almost surely, 2^21223030312 is an apocalyptic number.

21223030312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21223030312 is an abundant number, since it is smaller than the sum of its proper divisors (22187713688).

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

21223030312 is a wasteful number, since it uses less digits than its factorization.

21223030312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241170816 (or 241170812 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21223030312 its reverse (21303032212), we get a palindrome (42526062524).

The spelling of 21223030312 in words is "twenty-one billion, two hundred twenty-three million, thirty thousand, three hundred twelve".