21941500 has 48 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 7521600.

The previous prime is 21941489. The next prime is 21941501. The reversal of 21941500 is 514912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366 + ... + 6634.

It is an arithmetic number, because the mean of its divisors is an integer number (1141140).

Almost surely, 2^21941500 is an apocalyptic number.

21941500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21941500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27387360).

21941500 is an abundant number, since it is smaller than the sum of its proper divisors (32833220).

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

21941500 is a wasteful number, since it uses less digits than its factorization.

21941500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295 (or 6283 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21941500 is about 4684.1754877459. The cubic root of 21941500 is about 279.9553500232.

The spelling of 21941500 in words is "twenty-one million, nine hundred forty-one thousand, five hundred".