21011032 has 32 divisors (see below), whose sum is σ = 45177120. Its totient is φ = 8974080.

The previous prime is 21011009. The next prime is 21011033. The reversal of 21011032 is 23011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25182 + ... + 26002.

It is an arithmetic number, because the mean of its divisors is an integer number (1411785).

Almost surely, 2^21011032 is an apocalyptic number.

It is an amenable number.

21011032 is an abundant number, since it is smaller than the sum of its proper divisors (24166088).

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

21011032 is a wasteful number, since it uses less digits than its factorization.

21011032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21011032 is about 4583.7792267953. The cubic root of 21011032 is about 275.9407210084.

Adding to 21011032 its reverse (23011012), we get a palindrome (44022044).

The spelling of 21011032 in words is "twenty-one million, eleven thousand, thirty-two".