21522033 has 12 divisors (see below), whose sum is σ = 33478900. Its totient is φ = 13244256.

The previous prime is 21522001. The next prime is 21522037. The reversal of 21522033 is 33022512.

It can be written as a sum of positive squares in 2 ways, for example, as 5143824 + 16378209 = 2268^2 + 4047^2 .

It is not a de Polignac number, because 21522033 - 2⁵ = 21522001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21521997 and 21522015.

It is not an unprimeable number, because it can be changed into a prime (21522037) 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 11 ways as a sum of consecutive naturals, for example, 91858 + ... + 92091.

Almost surely, 2^21522033 is an apocalyptic number.

It is an amenable number.

21522033 is a deficient number, since it is larger than the sum of its proper divisors (11956867).

21522033 is a wasteful number, since it uses less digits than its factorization.

21522033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183968 (or 183965 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21522033 is about 4639.1845188567. The cubic root of 21522033 is about 278.1598420012.

Adding to 21522033 its reverse (33022512), we get a palindrome (54544545).

The spelling of 21522033 in words is "twenty-one million, five hundred twenty-two thousand, thirty-three".