21012032 has 28 divisors (see below), whose sum is σ = 41841420. Its totient is φ = 10469376.

The previous prime is 21011981. The next prime is 21012053. The reversal of 21012032 is 23021012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13957696 + 7054336 = 3736^2 + 2656^2 .

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, 36128 + ... + 36704.

Almost surely, 2^21012032 is an apocalyptic number.

It is an amenable number.

21012032 is a deficient number, since it is larger than the sum of its proper divisors (20829388).

21012032 is an equidigital number, since it uses as much as digits as its factorization.

21012032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1148 counting only the distinct ones).

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

The square root of 21012032 is about 4583.8883057945. Note that the first 3 decimals coincide. The cubic root of 21012032 is about 275.9450986507.

Adding to 21012032 its reverse (23021012), we get a palindrome (44033044).

The spelling of 21012032 in words is "twenty-one million, twelve thousand, thirty-two".