21522130 has 32 divisors (see below), whose sum is σ = 45360000. Its totient is φ = 7198080.

The previous prime is 21522103. The next prime is 21522131. The reversal of 21522130 is 3122512.

It is not an unprimeable number, because it can be changed into a prime (21522131) 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 15 ways as a sum of consecutive naturals, for example, 880 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (1417500).

Almost surely, 2^21522130 is an apocalyptic number.

21522130 is an abundant number, since it is smaller than the sum of its proper divisors (23837870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21522130 is a wasteful number, since it uses less digits than its factorization.

21522130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7554.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21522130 is about 4639.1949732685. The cubic root of 21522130 is about 278.1602598902.

Adding to 21522130 its reverse (3122512), we get a palindrome (24644642).

The spelling of 21522130 in words is "twenty-one million, five hundred twenty-two thousand, one hundred thirty".