21941552 has 30 divisors (see below), whose sum is σ = 43958124. Its totient is φ = 10609440.

The previous prime is 21941551. The next prime is 21941573. The reversal of 21941552 is 25514912.

It is not an unprimeable number, because it can be changed into a prime (21941551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14663 + ... + 16089.

Almost surely, 2^21941552 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 21941552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21979062).

21941552 is an abundant number, since it is smaller than the sum of its proper divisors (22016572).

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

21941552 is a wasteful number, since it uses less digits than its factorization.

21941552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497 (or 1460 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 21941552 is about 4684.1810383460. The cubic root of 21941552 is about 279.9555711820.

The spelling of 21941552 in words is "twenty-one million, nine hundred forty-one thousand, five hundred fifty-two".