21532122 has 32 divisors (see below), whose sum is σ = 48135360. Its totient is φ = 7134480.

The previous prime is 21532097. The next prime is 21532169. The reversal of 21532122 is 22123512.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21532095 and 21532104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8673 + ... + 10875.

It is an arithmetic number, because the mean of its divisors is an integer number (1504230).

Almost surely, 2^21532122 is an apocalyptic number.

21532122 is an abundant number, since it is smaller than the sum of its proper divisors (26603238).

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

21532122 is a wasteful number, since it uses less digits than its factorization.

21532122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395 (or 2389 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 21532122 is about 4640.2717592831. The cubic root of 21532122 is about 278.2033000432.

Adding to 21532122 its reverse (22123512), we get a palindrome (43655634).

The spelling of 21532122 in words is "twenty-one million, five hundred thirty-two thousand, one hundred twenty-two".