21366033 has 16 divisors (see below), whose sum is σ = 30844800. Its totient is φ = 13077504.

The previous prime is 21366017. The next prime is 21366041. The reversal of 21366033 is 33066312.

It is not a de Polignac number, because 21366033 - 2⁴ = 21366017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21365994 and 21366012.

It is not an unprimeable number, because it can be changed into a prime (21366053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6385 + ... + 9137.

It is an arithmetic number, because the mean of its divisors is an integer number (1927800).

Almost surely, 2^21366033 is an apocalyptic number.

It is an amenable number.

21366033 is a deficient number, since it is larger than the sum of its proper divisors (9478767).

21366033 is a wasteful number, since it uses less digits than its factorization.

21366033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 21366033 is about 4622.3406408442. The cubic root of 21366033 is about 277.4861416665.

The spelling of 21366033 in words is "twenty-one million, three hundred sixty-six thousand, thirty-three".