21459133 has 2 divisors, whose sum is σ = 21459134. Its totient is φ = 21459132.

The previous prime is 21459131. The next prime is 21459143. The reversal of 21459133 is 33195412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 7717284 = 3707^2 + 2778^2 .

It is a cyclic number.

It is not a de Polignac number, because 21459133 - 2¹ = 21459131 is a prime.

It is a super-2 number, since 2×21459133² = 920988778223378, which contains 22 as substring.

Together with 21459131, it forms a pair of twin primes.

It is equal to p_1357174 and since 21459133 and 1357174 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21459131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10729566 + 10729567.

It is an arithmetic number, because the mean of its divisors is an integer number (10729567).

Almost surely, 2^21459133 is an apocalyptic number.

It is an amenable number.

21459133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21459133 is an equidigital number, since it uses as much as digits as its factorization.

21459133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 21459133 is about 4632.4003497107. The cubic root of 21459133 is about 277.8885955292. Note that the first 3 decimals are identical.

The spelling of 21459133 in words is "twenty-one million, four hundred fifty-nine thousand, one hundred thirty-three".