21431430312 has 64 divisors (see below), whose sum is σ = 54295852800. Its totient is φ = 7048304640.

The previous prime is 21431430299. The next prime is 21431430329. The reversal of 21431430312 is 21303413412.

It is a happy number.

It is a super-2 number, since 2×21431430312² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3366012 + ... + 3372372.

It is an arithmetic number, because the mean of its divisors is an integer number (848372700).

Almost surely, 2^21431430312 is an apocalyptic number.

It is an amenable number.

21431430312 is an abundant number, since it is smaller than the sum of its proper divisors (32864422488).

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

21431430312 is a wasteful number, since it uses less digits than its factorization.

21431430312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8226 (or 8222 counting only the distinct ones).

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

Adding to 21431430312 its reverse (21303413412), we get a palindrome (42734843724).

The spelling of 21431430312 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, three hundred twelve".