21334497 has 4 divisors (see below), whose sum is σ = 28446000. Its totient is φ = 14222996.

The previous prime is 21334487. The next prime is 21334499. The reversal of 21334497 is 79443312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21334497 - 2⁶ = 21334433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21334499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3555747 + ... + 3555752.

It is an arithmetic number, because the mean of its divisors is an integer number (7111500).

Almost surely, 2^21334497 is an apocalyptic number.

It is an amenable number.

21334497 is a deficient number, since it is larger than the sum of its proper divisors (7111503).

21334497 is an equidigital number, since it uses as much as digits as its factorization.

21334497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111502.

The product of its digits is 18144, while the sum is 33.

The square root of 21334497 is about 4618.9281224111. The cubic root of 21334497 is about 277.3495524073.

It can be divided in two parts, 213 and 34497, that multiplied together give a triangular number (7347861 = T₃₈₃₃).

The spelling of 21334497 in words is "twenty-one million, three hundred thirty-four thousand, four hundred ninety-seven".