21297334 has 4 divisors (see below), whose sum is σ = 31946004. Its totient is φ = 10648666.

The previous prime is 21297329. The next prime is 21297337. The reversal of 21297334 is 43379212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21297296 and 21297305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21297337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5324332 + ... + 5324335.

It is an arithmetic number, because the mean of its divisors is an integer number (7986501).

Almost surely, 2^21297334 is an apocalyptic number.

21297334 is a deficient number, since it is larger than the sum of its proper divisors (10648670).

21297334 is a wasteful number, since it uses less digits than its factorization.

21297334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10648669.

The product of its digits is 9072, while the sum is 31.

The square root of 21297334 is about 4614.9034659460. The cubic root of 21297334 is about 277.1884185099.

The spelling of 21297334 in words is "twenty-one million, two hundred ninety-seven thousand, three hundred thirty-four".