21433051 has 2 divisors, whose sum is σ = 21433052. Its totient is φ = 21433050.

The previous prime is 21432991. The next prime is 21433057. The reversal of 21433051 is 15033412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21433051 - 2⁹ = 21432539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21433057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716525 + 10716526.

It is an arithmetic number, because the mean of its divisors is an integer number (10716526).

Almost surely, 2^21433051 is an apocalyptic number.

21433051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433051 is an equidigital number, since it uses as much as digits as its factorization.

21433051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21433051 is about 4629.5843225931. The cubic root of 21433051 is about 277.7759654934.

Adding to 21433051 its reverse (15033412), we get a palindrome (36466463).

The spelling of 21433051 in words is "twenty-one million, four hundred thirty-three thousand, fifty-one".