21431234210 has 8 divisors (see below), whose sum is σ = 38576221596. Its totient is φ = 8572493680.

The previous prime is 21431234207. The next prime is 21431234213. The reversal of 21431234210 is 1243213412.

It is an interprime number because it is at equal distance from previous prime (21431234207) and next prime (21431234213).

It can be written as a sum of positive squares in 2 ways, for example, as 21430910449 + 323761 = 146393^2 + 569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21431234213) 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, 1071561701 + ... + 1071561720.

Almost surely, 2^21431234210 is an apocalyptic number.

21431234210 is a deficient number, since it is larger than the sum of its proper divisors (17144987386).

21431234210 is a wasteful number, since it uses less digits than its factorization.

21431234210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143123428.

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

Adding to 21431234210 its reverse (1243213412), we get a palindrome (22674447622).

The spelling of 21431234210 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirty-four thousand, two hundred ten".