21522133 has 4 divisors (see below), whose sum is σ = 21591648. Its totient is φ = 21452620.

The previous prime is 21522131. The next prime is 21522139. The reversal of 21522133 is 33122512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21522133 - 2¹ = 21522131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21522133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34291 + ... + 34912.

It is an arithmetic number, because the mean of its divisors is an integer number (5397912).

Almost surely, 2^21522133 is an apocalyptic number.

It is an amenable number.

21522133 is a deficient number, since it is larger than the sum of its proper divisors (69515).

21522133 is an equidigital number, since it uses as much as digits as its factorization.

21522133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69514.

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

The square root of 21522133 is about 4639.1952966005. The cubic root of 21522133 is about 278.1602728146.

Adding to 21522133 its reverse (33122512), we get a palindrome (54644645).

The spelling of 21522133 in words is "twenty-one million, five hundred twenty-two thousand, one hundred thirty-three".