21337867 has 2 divisors, whose sum is σ = 21337868. Its totient is φ = 21337866.

The previous prime is 21337837. The next prime is 21337891. The reversal of 21337867 is 76873312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21337867 - 2¹¹ = 21335819 is a prime.

It is not a weakly prime, because it can be changed into another prime (21337837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668933 + 10668934.

It is an arithmetic number, because the mean of its divisors is an integer number (10668934).

Almost surely, 2^21337867 is an apocalyptic number.

21337867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21337867 is an equidigital number, since it uses as much as digits as its factorization.

21337867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 21337867 is about 4619.2929112582. The cubic root of 21337867 is about 277.3641550293.

It can be divided in two parts, 2133 and 7867, that added together give a 4-th power (10000 = 10⁴).

The spelling of 21337867 in words is "twenty-one million, three hundred thirty-seven thousand, eight hundred sixty-seven".