21602719 has 2 divisors, whose sum is σ = 21602720. Its totient is φ = 21602718.

The previous prime is 21602689. The next prime is 21602731. The reversal of 21602719 is 91720612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21602719 - 2⁵ = 21602687 is a prime.

It is a super-2 number, since 2×21602719² = 933354936385922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21602759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801359 + 10801360.

It is an arithmetic number, because the mean of its divisors is an integer number (10801360).

Almost surely, 2^21602719 is an apocalyptic number.

21602719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21602719 is an equidigital number, since it uses as much as digits as its factorization.

21602719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 21602719 is about 4647.8725240695. The cubic root of 21602719 is about 278.5070151561.

The spelling of 21602719 in words is "twenty-one million, six hundred two thousand, seven hundred nineteen".