21522105 has 40 divisors (see below), whose sum is σ = 42096384. Its totient is φ = 10432800.

The previous prime is 21522103. The next prime is 21522131. The reversal of 21522105 is 50122512.

It is not a de Polignac number, because 21522105 - 2¹ = 21522103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522101) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2040 + ... + 6870.

Almost surely, 2^21522105 is an apocalyptic number.

It is an amenable number.

21522105 is a deficient number, since it is larger than the sum of its proper divisors (20574279).

21522105 is a wasteful number, since it uses less digits than its factorization.

21522105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4859 (or 4850 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21522105 is about 4639.1922788348. The cubic root of 21522105 is about 278.1601521870.

Adding to 21522105 its reverse (50122512), we get a palindrome (71644617).

The spelling of 21522105 in words is "twenty-one million, five hundred twenty-two thousand, one hundred five".