21075132 has 48 divisors (see below), whose sum is σ = 53978400. Its totient is φ = 6359808.

The previous prime is 21075113. The next prime is 21075137. The reversal of 21075132 is 23157012.

It is a super-2 number, since 2×21075132² = 888322377634848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21075099 and 21075108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075137) 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, 6994 + ... + 9542.

It is an arithmetic number, because the mean of its divisors is an integer number (1124550).

Almost surely, 2^21075132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21075132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26989200).

21075132 is an abundant number, since it is smaller than the sum of its proper divisors (32903268).

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

21075132 is a wasteful number, since it uses less digits than its factorization.

21075132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 2620 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21075132 is about 4590.7659491636. The cubic root of 21075132 is about 276.2210474493.

The spelling of 21075132 in words is "twenty-one million, seventy-five thousand, one hundred thirty-two".