21231331039 has 2 divisors, whose sum is σ = 21231331040. Its totient is φ = 21231331038.

The previous prime is 21231331021. The next prime is 21231331081. The reversal of 21231331039 is 93013313212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21231331039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231330998 and 21231331016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231331439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615665519 + 10615665520.

It is an arithmetic number, because the mean of its divisors is an integer number (10615665520).

Almost surely, 2^21231331039 is an apocalyptic number.

21231331039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231331039 is an equidigital number, since it uses as much as digits as its factorization.

21231331039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 21231331039 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-one thousand, thirty-nine".