21431434234 has 64 divisors (see below), whose sum is σ = 39233376000. Its totient is φ = 8571018240.

The previous prime is 21431434163. The next prime is 21431434253. The reversal of 21431434234 is 43243413412.

It is a junction number, because it is equal to n+sod(n) for n = 21431434196 and 21431434205.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21495424 + ... + 21496420.

It is an arithmetic number, because the mean of its divisors is an integer number (613021500).

Almost surely, 2^21431434234 is an apocalyptic number.

21431434234 is a deficient number, since it is larger than the sum of its proper divisors (17801941766).

21431434234 is a wasteful number, since it uses less digits than its factorization.

21431434234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703.

The product of its digits is 27648, while the sum is 31.

Adding to 21431434234 its reverse (43243413412), we get a palindrome (64674847646).

The spelling of 21431434234 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty-four thousand, two hundred thirty-four".