21796203887 has 2 divisors, whose sum is σ = 21796203888. Its totient is φ = 21796203886.

The previous prime is 21796203841. The next prime is 21796203911. The reversal of 21796203887 is 78830269712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21796203887 - 2⁸ = 21796203631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21796203817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898101943 + 10898101944.

It is an arithmetic number, because the mean of its divisors is an integer number (10898101944).

Almost surely, 2^21796203887 is an apocalyptic number.

21796203887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796203887 is an equidigital number, since it uses as much as digits as its factorization.

21796203887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 21796203887 in words is "twenty-one billion, seven hundred ninety-six million, two hundred three thousand, eight hundred eighty-seven".