21522089 has 16 divisors (see below), whose sum is σ = 23829120. Its totient is φ = 19367040.

The previous prime is 21522077. The next prime is 21522101. The reversal of 21522089 is 98022512.

It is an interprime number because it is at equal distance from previous prime (21522077) and next prime (21522101).

It is a cyclic number.

It is not a de Polignac number, because 21522089 - 2⁴ = 21522073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21522689) 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, 26954 + ... + 27740.

It is an arithmetic number, because the mean of its divisors is an integer number (1489320).

Almost surely, 2^21522089 is an apocalyptic number.

21522089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21522089 is a deficient number, since it is larger than the sum of its proper divisors (2307031).

21522089 is a wasteful number, since it uses less digits than its factorization.

21522089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21522089 is about 4639.1905543963. The cubic root of 21522089 is about 278.1600832569.

The spelling of 21522089 in words is "twenty-one million, five hundred twenty-two thousand, eighty-nine".