21231431034 has 32 divisors (see below), whose sum is σ = 46360097280. Its totient is φ = 6428631600.

The previous prime is 21231431029. The next prime is 21231431069. The reversal of 21231431034 is 43013413212.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21231430995 and 21231431013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44662 + ... + 210849.

It is an arithmetic number, because the mean of its divisors is an integer number (1448753040).

Almost surely, 2^21231431034 is an apocalyptic number.

21231431034 is an abundant number, since it is smaller than the sum of its proper divisors (25128666246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231431034 is a wasteful number, since it uses less digits than its factorization.

21231431034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256786.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21231431034 its reverse (43013413212), we get a palindrome (64244844246).

The spelling of 21231431034 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-one thousand, thirty-four".