21775032 has 48 divisors (see below), whose sum is σ = 59317440. Its totient is φ = 7216128.

The previous prime is 21775031. The next prime is 21775037. The reversal of 21775032 is 23057712.

It is a junction number, because it is equal to n+sod(n) for n = 21774987 and 21775005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21775031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13113 + ... + 14679.

It is an arithmetic number, because the mean of its divisors is an integer number (1235780).

Almost surely, 2^21775032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21775032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29658720).

21775032 is an abundant number, since it is smaller than the sum of its proper divisors (37542408).

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

21775032 is a wasteful number, since it uses less digits than its factorization.

21775032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21775032 is about 4666.3724669169. The cubic root of 21775032 is about 279.2455540430.

The spelling of 21775032 in words is "twenty-one million, seven hundred seventy-five thousand, thirty-two".