21600401 has 8 divisors (see below), whose sum is σ = 22374144. Its totient is φ = 20839840.

The previous prime is 21600391. The next prime is 21600419. The reversal of 21600401 is 10400612.

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

It is a cyclic number.

It is not a de Polignac number, because 21600401 - 2¹⁸ = 21338257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21600451) 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, 101 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (2796768).

Almost surely, 2^21600401 is an apocalyptic number.

It is an amenable number.

21600401 is a deficient number, since it is larger than the sum of its proper divisors (773743).

21600401 is an equidigital number, since it uses as much as digits as its factorization.

21600401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6591.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21600401 is about 4647.6231559798. The cubic root of 21600401 is about 278.4970534108.

The spelling of 21600401 in words is "twenty-one million, six hundred thousand, four hundred one".