21431220410 has 8 divisors (see below), whose sum is σ = 38576196756. Its totient is φ = 8572488160.

The previous prime is 21431220389. The next prime is 21431220427. The reversal of 21431220410 is 1402213412.

It can be written as a sum of positive squares in 2 ways, for example, as 21429739321 + 1481089 = 146389^2 + 1217^2 .

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, 1071561011 + ... + 1071561030.

Almost surely, 2^21431220410 is an apocalyptic number.

21431220410 is a deficient number, since it is larger than the sum of its proper divisors (17144976346).

21431220410 is a wasteful number, since it uses less digits than its factorization.

21431220410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143122048.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21431220410 its reverse (1402213412), we get a palindrome (22833433822).

The spelling of 21431220410 in words is "twenty-one billion, four hundred thirty-one million, two hundred twenty thousand, four hundred ten".