21303573887 has 2 divisors, whose sum is σ = 21303573888. Its totient is φ = 21303573886.

The previous prime is 21303573871. The next prime is 21303573899. The reversal of 21303573887 is 78837530312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21303573887 - 2⁴ = 21303573871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303573827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651786943 + 10651786944.

It is an arithmetic number, because the mean of its divisors is an integer number (10651786944).

Almost surely, 2^21303573887 is an apocalyptic number.

21303573887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303573887 is an equidigital number, since it uses as much as digits as its factorization.

21303573887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21303573887 in words is "twenty-one billion, three hundred three million, five hundred seventy-three thousand, eight hundred eighty-seven".