21431431330 has 16 divisors (see below), whose sum is σ = 40606922880. Its totient is φ = 8121384432.

The previous prime is 21431431321. The next prime is 21431431331. The reversal of 21431431330 is 3313413412.

It is a junction number, because it is equal to n+sod(n) for n = 21431431295 and 21431431304.

It is not an unprimeable number, because it can be changed into a prime (21431431331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56398314 + ... + 56398693.

It is an arithmetic number, because the mean of its divisors is an integer number (2537932680).

Almost surely, 2^21431431330 is an apocalyptic number.

21431431330 is a deficient number, since it is larger than the sum of its proper divisors (19175491550).

21431431330 is a wasteful number, since it uses less digits than its factorization.

21431431330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112797033.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21431431330 its reverse (3313413412), we get a palindrome (24744844742).

The spelling of 21431431330 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty-one thousand, three hundred thirty".