21938801 has 8 divisors (see below), whose sum is σ = 22471680. Its totient is φ = 21408768.

The previous prime is 21938779. The next prime is 21938831. The reversal of 21938801 is 10883912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21938801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21938831) 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, 28145 + ... + 28913.

It is an arithmetic number, because the mean of its divisors is an integer number (2808960).

Almost surely, 2^21938801 is an apocalyptic number.

It is an amenable number.

21938801 is a deficient number, since it is larger than the sum of its proper divisors (532879).

21938801 is an equidigital number, since it uses as much as digits as its factorization.

21938801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 21938801 is about 4683.8873812251. The cubic root of 21938801 is about 279.9438705516.

The spelling of 21938801 in words is "twenty-one million, nine hundred thirty-eight thousand, eight hundred one".