21522153 has 16 divisors (see below), whose sum is σ = 31366656. Its totient is φ = 13067520.

The previous prime is 21522139. The next prime is 21522161. The reversal of 21522153 is 35122512.

It is not a de Polignac number, because 21522153 - 2²⁰ = 20473577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21522103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5226 + ... + 8387.

It is an arithmetic number, because the mean of its divisors is an integer number (1960416).

Almost surely, 2^21522153 is an apocalyptic number.

It is an amenable number.

21522153 is a deficient number, since it is larger than the sum of its proper divisors (9844503).

21522153 is a wasteful number, since it uses less digits than its factorization.

21522153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13664.

The product of its digits is 600, while the sum is 21.

The square root of 21522153 is about 4639.1974521462. The cubic root of 21522153 is about 278.1603589771.

Adding to 21522153 its reverse (35122512), we get a palindrome (56644665).

The spelling of 21522153 in words is "twenty-one million, five hundred twenty-two thousand, one hundred fifty-three".