21020132 has 12 divisors (see below), whose sum is σ = 42040320. Its totient is φ = 9008616.

The previous prime is 21020119. The next prime is 21020159. The reversal of 21020132 is 23102012.

It is a happy number.

21020132 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375332 + ... + 375387.

It is an arithmetic number, because the mean of its divisors is an integer number (3503360).

Almost surely, 2^21020132 is an apocalyptic number.

It is an amenable number.

21020132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21020132 is a wasteful number, since it uses less digits than its factorization.

21020132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750730 (or 750728 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21020132 is about 4584.7717500438. The cubic root of 21020132 is about 275.9805524349.

Adding to 21020132 its reverse (23102012), we get a palindrome (44122144).

The spelling of 21020132 in words is "twenty-one million, twenty thousand, one hundred thirty-two".