21710265407 has 2 divisors, whose sum is σ = 21710265408. Its totient is φ = 21710265406.

The previous prime is 21710265403. The next prime is 21710265487. The reversal of 21710265407 is 70456201712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21710265407 - 2² = 21710265403 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21710265403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855132703 + 10855132704.

It is an arithmetic number, because the mean of its divisors is an integer number (10855132704).

Almost surely, 2^21710265407 is an apocalyptic number.

21710265407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21710265407 is an equidigital number, since it uses as much as digits as its factorization.

21710265407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 21710265407 in words is "twenty-one billion, seven hundred ten million, two hundred sixty-five thousand, four hundred seven".