21431434210 has 8 divisors (see below), whose sum is σ = 38576581596. Its totient is φ = 8572573680.

The previous prime is 21431434163. The next prime is 21431434253. The reversal of 21431434210 is 1243413412.

It can be written as a sum of positive squares in 2 ways, for example, as 20178486601 + 1252947609 = 142051^2 + 35397^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071571701 + ... + 1071571720.

Almost surely, 2^21431434210 is an apocalyptic number.

21431434210 is a deficient number, since it is larger than the sum of its proper divisors (17145147386).

21431434210 is a wasteful number, since it uses less digits than its factorization.

21431434210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143143428.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21431434210 its reverse (1243413412), we get a palindrome (22674847622).

The spelling of 21431434210 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty-four thousand, two hundred ten".