21931529803 has 2 divisors, whose sum is σ = 21931529804. Its totient is φ = 21931529802.

The previous prime is 21931529729. The next prime is 21931529833. The reversal of 21931529803 is 30892513912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21931529803 - 2²⁹ = 21394658891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21931529803.

It is not a weakly prime, because it can be changed into another prime (21931529833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10965764901 + 10965764902.

It is an arithmetic number, because the mean of its divisors is an integer number (10965764902).

Almost surely, 2^21931529803 is an apocalyptic number.

21931529803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21931529803 is an equidigital number, since it uses as much as digits as its factorization.

21931529803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 21931529803 in words is "twenty-one billion, nine hundred thirty-one million, five hundred twenty-nine thousand, eight hundred three".