21051033 has 8 divisors (see below), whose sum is σ = 28116288. Its totient is φ = 14009904.

The previous prime is 21051029. The next prime is 21051047. The reversal of 21051033 is 33015012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21051033 - 2² = 21051029 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21050033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3885 + ... + 7562.

It is an arithmetic number, because the mean of its divisors is an integer number (3514536).

Almost surely, 2^21051033 is an apocalyptic number.

It is an amenable number.

21051033 is a deficient number, since it is larger than the sum of its proper divisors (7065255).

21051033 is a wasteful number, since it uses less digits than its factorization.

21051033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12063.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 21051033 is about 4588.1404730021. The cubic root of 21051033 is about 276.1157228438.

Adding to 21051033 its reverse (33015012), we get a palindrome (54066045).

The spelling of 21051033 in words is "twenty-one million, fifty-one thousand, thirty-three".