21294717007 has 2 divisors, whose sum is σ = 21294717008. Its totient is φ = 21294717006.

The previous prime is 21294716959. The next prime is 21294717053. The reversal of 21294717007 is 70071749212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21294717007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21294717907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10647358503 + 10647358504.

It is an arithmetic number, because the mean of its divisors is an integer number (10647358504).

Almost surely, 2^21294717007 is an apocalyptic number.

21294717007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21294717007 is an equidigital number, since it uses as much as digits as its factorization.

21294717007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 21294717007 in words is "twenty-one billion, two hundred ninety-four million, seven hundred seventeen thousand, seven".