21320133 has 16 divisors (see below), whose sum is σ = 29548800. Its totient is φ = 13657280.

The previous prime is 21320107. The next prime is 21320183. The reversal of 21320133 is 33102312.

It is a cyclic number.

It is not a de Polignac number, because 21320133 - 2¹² = 21316037 is a prime.

It is a super-2 number, since 2×21320133² = 909096142275378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320183) 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 15 ways as a sum of consecutive naturals, for example, 22948 + ... + 23858.

It is an arithmetic number, because the mean of its divisors is an integer number (1846800).

Almost surely, 2^21320133 is an apocalyptic number.

It is an amenable number.

21320133 is a deficient number, since it is larger than the sum of its proper divisors (8228667).

21320133 is a wasteful number, since it uses less digits than its factorization.

21320133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21320133 is about 4617.3729543973. The cubic root of 21320133 is about 277.2872941880.

Adding to 21320133 its reverse (33102312), we get a palindrome (54422445).

The spelling of 21320133 in words is "twenty-one million, three hundred twenty thousand, one hundred thirty-three".