21214033 has 4 divisors (see below), whose sum is σ = 21224500. Its totient is φ = 21203568.

The previous prime is 21214021. The next prime is 21214049. The reversal of 21214033 is 33041212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6066369 + 15147664 = 2463^2 + 3892^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214033 - 2⁵ = 21214001 is a prime.

It is a super-2 number, since 2×21214033² = 900070392250178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213998 and 21214016.

It is not an unprimeable number, because it can be changed into a prime (21214003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (5306125).

Almost surely, 2^21214033 is an apocalyptic number.

It is an amenable number.

21214033 is a deficient number, since it is larger than the sum of its proper divisors (10467).

21214033 is an equidigital number, since it uses as much as digits as its factorization.

21214033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21214033 is about 4605.8694076146. The cubic root of 21214033 is about 276.8265540879.

Adding to 21214033 its reverse (33041212), we get a palindrome (54255245).

The spelling of 21214033 in words is "twenty-one million, two hundred fourteen thousand, thirty-three".