21416033 has 2 divisors, whose sum is σ = 21416034. Its totient is φ = 21416032.

The previous prime is 21416029. The next prime is 21416051. The reversal of 21416033 is 33061412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 3717184 = 4207^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 21416033 - 2² = 21416029 is a prime.

It is equal to p_1354610 and since 21416033 and 1354610 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21415996 and 21416014.

It is not a weakly prime, because it can be changed into another prime (21416023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708016 + 10708017.

It is an arithmetic number, because the mean of its divisors is an integer number (10708017).

Almost surely, 2^21416033 is an apocalyptic number.

It is an amenable number.

21416033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416033 is an equidigital number, since it uses as much as digits as its factorization.

21416033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21416033 is about 4627.7459956225. The cubic root of 21416033 is about 277.7024273073.

Adding to 21416033 its reverse (33061412), we get a palindrome (54477445).

The spelling of 21416033 in words is "twenty-one million, four hundred sixteen thousand, thirty-three".