21372719 has 2 divisors, whose sum is σ = 21372720. Its totient is φ = 21372718.

The previous prime is 21372713. The next prime is 21372737. The reversal of 21372719 is 91727312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21372719 - 2¹⁶ = 21307183 is a prime.

It is a super-2 number, since 2×21372719² = 913586234905922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21372713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686359 + 10686360.

It is an arithmetic number, because the mean of its divisors is an integer number (10686360).

Almost surely, 2^21372719 is an apocalyptic number.

21372719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21372719 is an equidigital number, since it uses as much as digits as its factorization.

21372719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 32.

The square root of 21372719 is about 4623.0638109375. The cubic root of 21372719 is about 277.5150829126.

The spelling of 21372719 in words is "twenty-one million, three hundred seventy-two thousand, seven hundred nineteen".