21367097 has 4 divisors (see below), whose sum is σ = 21378420. Its totient is φ = 21355776.

The previous prime is 21367067. The next prime is 21367111. The reversal of 21367097 is 79076312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 609961 + 20757136 = 781^2 + 4556^2 .

It is a cyclic number.

It is not a de Polignac number, because 21367097 - 2²⁰ = 20318521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21367067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (5344605).

Almost surely, 2^21367097 is an apocalyptic number.

It is an amenable number.

21367097 is a deficient number, since it is larger than the sum of its proper divisors (11323).

21367097 is an equidigital number, since it uses as much as digits as its factorization.

21367097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11322.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 21367097 is about 4622.4557326166. The cubic root of 21367097 is about 277.4907477369.

The spelling of 21367097 in words is "twenty-one million, three hundred sixty-seven thousand, ninety-seven".