21002032 has 20 divisors (see below), whose sum is σ = 42095520. Its totient is φ = 10138688.

The previous prime is 21001991. The next prime is 21002039. The reversal of 21002032 is 23020012.

It is not an unprimeable number, because it can be changed into a prime (21002039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22168 + ... + 23095.

It is an arithmetic number, because the mean of its divisors is an integer number (2104776).

Almost surely, 2^21002032 is an apocalyptic number.

It is an amenable number.

21002032 is an abundant number, since it is smaller than the sum of its proper divisors (21093488).

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

21002032 is a wasteful number, since it uses less digits than its factorization.

21002032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45300 (or 45294 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21002032 is about 4582.7973989693. The cubic root of 21002032 is about 275.9013159764.

Adding to 21002032 its reverse (23020012), we get a palindrome (44022044).

The spelling of 21002032 in words is "twenty-one million, two thousand, thirty-two".