21433431312 has 30 divisors (see below), whose sum is σ = 59983839422. Its totient is φ = 7144477056.

The previous prime is 21433431307. The next prime is 21433431317. The reversal of 21433431312 is 21313433412.

It is a happy number.

21433431312 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 343 + 1 + 312 = 666.

It is an interprime number because it is at equal distance from previous prime (21433431307) and next prime (21433431317).

It can be written as a sum of positive squares in only one way, i.e., 20006405136 + 1427026176 = 141444^2 + 37776^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21433431317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74421493 + ... + 74421780.

Almost surely, 2^21433431312 is an apocalyptic number.

It is an amenable number.

21433431312 is an abundant number, since it is smaller than the sum of its proper divisors (38550408110).

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

21433431312 is a wasteful number, since it uses less digits than its factorization.

21433431312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148843287 (or 148843278 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21433431312 its reverse (21313433412), we get a palindrome (42746864724).

The spelling of 21433431312 in words is "twenty-one billion, four hundred thirty-three million, four hundred thirty-one thousand, three hundred twelve".