21941304 has 128 divisors (see below), whose sum is σ = 70778880. Its totient is φ = 5500800.

The previous prime is 21941291. The next prime is 21941327. The reversal of 21941304 is 40314912.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57097 + ... + 57479.

It is an arithmetic number, because the mean of its divisors is an integer number (552960).

Almost surely, 2^21941304 is an apocalyptic number.

21941304 is a gapful number since it is divisible by the number (24) 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 21941304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35389440).

21941304 is an abundant number, since it is smaller than the sum of its proper divisors (48837576).

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

21941304 is a wasteful number, since it uses less digits than its factorization.

21941304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21941304 is about 4684.1545661944. The cubic root of 21941304 is about 279.9545164215.

The spelling of 21941304 in words is "twenty-one million, nine hundred forty-one thousand, three hundred four".