21367719 has 14 divisors (see below), whose sum is σ = 32038016. Its totient is φ = 14244660.

The previous prime is 21367699. The next prime is 21367721. The reversal of 21367719 is 91776312.

It is a happy number.

It is not a de Polignac number, because 21367719 - 2²¹ = 19270567 is a prime.

It is a super-2 number, since 2×21367719² = 913158830525922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367729) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 13927 + ... + 15384.

Almost surely, 2^21367719 is an apocalyptic number.

21367719 is a deficient number, since it is larger than the sum of its proper divisors (10670297).

21367719 is an frugal number, since it uses more digits than its factorization.

21367719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29329 (or 29314 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 21367719 is about 4622.5230123819. The cubic root of 21367719 is about 277.4934403124.

The spelling of 21367719 in words is "twenty-one million, three hundred sixty-seven thousand, seven hundred nineteen".