21132562 has 16 divisors (see below), whose sum is σ = 34659072. Its totient is φ = 9583920.

The previous prime is 21132557. The next prime is 21132569. The reversal of 21132562 is 26523112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21132569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12703 + ... + 14269.

It is an arithmetic number, because the mean of its divisors is an integer number (2166192).

Almost surely, 2^21132562 is an apocalyptic number.

21132562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21132562 is a deficient number, since it is larger than the sum of its proper divisors (13526510).

21132562 is a wasteful number, since it uses less digits than its factorization.

21132562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193.

The product of its digits is 720, while the sum is 22.

The square root of 21132562 is about 4597.0166412577. The cubic root of 21132562 is about 276.4717218338.

Adding to 21132562 its reverse (26523112), we get a palindrome (47655674).

The spelling of 21132562 in words is "twenty-one million, one hundred thirty-two thousand, five hundred sixty-two".