21949000903 has 2 divisors, whose sum is σ = 21949000904. Its totient is φ = 21949000902.

The previous prime is 21949000889. The next prime is 21949000939. The reversal of 21949000903 is 30900094912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21949000903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21949000603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974500451 + 10974500452.

It is an arithmetic number, because the mean of its divisors is an integer number (10974500452).

Almost surely, 2^21949000903 is an apocalyptic number.

21949000903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21949000903 is an equidigital number, since it uses as much as digits as its factorization.

21949000903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The spelling of 21949000903 in words is "twenty-one billion, nine hundred forty-nine million, nine hundred three", and thus it is an aban number.