21431430212 has 12 divisors (see below), whose sum is σ = 37511315436. Its totient is φ = 10713911520.

The previous prime is 21431430211. The next prime is 21431430253. The reversal of 21431430212 is 21203413412.

It can be written as a sum of positive squares in 2 ways, for example, as 5722317316 + 15709112896 = 75646^2 + 125336^2 .

It is not an unprimeable number, because it can be changed into a prime (21431430211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423983 + ... + 471830.

It is an arithmetic number, because the mean of its divisors is an integer number (3125942953).

Almost surely, 2^21431430212 is an apocalyptic number.

It is an amenable number.

21431430212 is a deficient number, since it is larger than the sum of its proper divisors (16079885224).

21431430212 is a wasteful number, since it uses less digits than its factorization.

21431430212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901798 (or 901796 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21431430212 its reverse (21203413412), we get a palindrome (42634843624).

The spelling of 21431430212 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, two hundred twelve".