21296834087 has 2 divisors, whose sum is σ = 21296834088. Its totient is φ = 21296834086.

The previous prime is 21296834077. The next prime is 21296834101. The reversal of 21296834087 is 78043869212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21296834087 - 2⁴ = 21296834071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21296834077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10648417043 + 10648417044.

It is an arithmetic number, because the mean of its divisors is an integer number (10648417044).

Almost surely, 2^21296834087 is an apocalyptic number.

21296834087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21296834087 is an equidigital number, since it uses as much as digits as its factorization.

21296834087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 21296834087 in words is "twenty-one billion, two hundred ninety-six million, eight hundred thirty-four thousand, eighty-seven".