21010994959 has 2 divisors, whose sum is σ = 21010994960. Its totient is φ = 21010994958.

The previous prime is 21010994957. The next prime is 21010994971. The reversal of 21010994959 is 95949901012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010994959 - 2¹ = 21010994957 is a prime.

Together with 21010994957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010994957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505497479 + 10505497480.

It is an arithmetic number, because the mean of its divisors is an integer number (10505497480).

Almost surely, 2^21010994959 is an apocalyptic number.

21010994959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010994959 is an equidigital number, since it uses as much as digits as its factorization.

21010994959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 49.

The spelling of 21010994959 in words is "twenty-one billion, ten million, nine hundred ninety-four thousand, nine hundred fifty-nine".