21363297 has 16 divisors (see below), whose sum is σ = 29834880. Its totient is φ = 13571712.

The previous prime is 21363289. The next prime is 21363301. The reversal of 21363297 is 79236312.

It is a happy number.

It is not a de Polignac number, because 21363297 - 2³ = 21363289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21363257) 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 in 15 ways as a sum of consecutive naturals, for example, 27843 + ... + 28599.

It is an arithmetic number, because the mean of its divisors is an integer number (1864680).

Almost surely, 2^21363297 is an apocalyptic number.

It is an amenable number.

21363297 is a deficient number, since it is larger than the sum of its proper divisors (8471583).

21363297 is a wasteful number, since it uses less digits than its factorization.

21363297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192.

The product of its digits is 13608, while the sum is 33.

The square root of 21363297 is about 4622.0446774128. The cubic root of 21363297 is about 277.4742967834.

The spelling of 21363297 in words is "twenty-one million, three hundred sixty-three thousand, two hundred ninety-seven".