21010332 has 24 divisors (see below), whose sum is σ = 56027776. Its totient is φ = 6002928.

The previous prime is 21010321. The next prime is 21010337. The reversal of 21010332 is 23301012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010337) 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 7 ways as a sum of consecutive naturals, for example, 124978 + ... + 125145.

Almost surely, 2^21010332 is an apocalyptic number.

It is an amenable number.

21010332 is an abundant number, since it is smaller than the sum of its proper divisors (35017444).

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

21010332 is a wasteful number, since it uses less digits than its factorization.

21010332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250137 (or 250135 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21010332 is about 4583.7028699513. The cubic root of 21010332 is about 275.9376565762.

Adding to 21010332 its reverse (23301012), we get a palindrome (44311344).

The spelling of 21010332 in words is "twenty-one million, ten thousand, three hundred thirty-two".