21124631903 has 2 divisors, whose sum is σ = 21124631904. Its totient is φ = 21124631902.

The previous prime is 21124631881. The next prime is 21124631923. The reversal of 21124631903 is 30913642112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21124631903 - 2²⁸ = 20856196447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21124631903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124631923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562315951 + 10562315952.

It is an arithmetic number, because the mean of its divisors is an integer number (10562315952).

Almost surely, 2^21124631903 is an apocalyptic number.

21124631903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124631903 is an equidigital number, since it uses as much as digits as its factorization.

21124631903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 21124631903 in words is "twenty-one billion, one hundred twenty-four million, six hundred thirty-one thousand, nine hundred three".