21933201 has 16 divisors (see below), whose sum is σ = 30888000. Its totient is φ = 13805568.

The previous prime is 21933173. The next prime is 21933209. The reversal of 21933201 is 10233912.

It is a happy number.

It is not a de Polignac number, because 21933201 - 2⁹ = 21932689 is a prime.

It is a super-2 number, since 2×21933201² = 962130612212802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21933209) 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, 25165 + ... + 26021.

It is an arithmetic number, because the mean of its divisors is an integer number (1930500).

Almost surely, 2^21933201 is an apocalyptic number.

It is an amenable number.

21933201 is a deficient number, since it is larger than the sum of its proper divisors (8954799).

21933201 is a wasteful number, since it uses less digits than its factorization.

21933201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21933201 is about 4683.2895490243. The cubic root of 21933201 is about 279.9200494522.

The spelling of 21933201 in words is "twenty-one million, nine hundred thirty-three thousand, two hundred one".