21143304312 has 64 divisors (see below), whose sum is σ = 56948979360. Its totient is φ = 6502809600.

The previous prime is 21143304269. The next prime is 21143304319. The reversal of 21143304312 is 21340334112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143304319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773112 + ... + 799992.

Almost surely, 2^21143304312 is an apocalyptic number.

It is an amenable number.

21143304312 is an abundant number, since it is smaller than the sum of its proper divisors (35805675048).

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

21143304312 is a wasteful number, since it uses less digits than its factorization.

21143304312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29424 (or 29420 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21143304312 its reverse (21340334112), we get a palindrome (42483638424).

The spelling of 21143304312 in words is "twenty-one billion, one hundred forty-three million, three hundred four thousand, three hundred twelve".