21294719 has 2 divisors, whose sum is σ = 21294720. Its totient is φ = 21294718.

The previous prime is 21294709. The next prime is 21294731. The reversal of 21294719 is 91749212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21294719 - 2¹² = 21290623 is a prime.

It is a super-2 number, since 2×21294719² = 906930114577922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21294709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10647359 + 10647360.

It is an arithmetic number, because the mean of its divisors is an integer number (10647360).

Almost surely, 2^21294719 is an apocalyptic number.

21294719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21294719 is an equidigital number, since it uses as much as digits as its factorization.

21294719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 21294719 is about 4614.6201360459. The cubic root of 21294719 is about 277.1770731558.

The spelling of 21294719 in words is "twenty-one million, two hundred ninety-four thousand, seven hundred nineteen".