21214801 has 8 divisors (see below), whose sum is σ = 21853800. Its totient is φ = 20579328.

The previous prime is 21214777. The next prime is 21214847. The reversal of 21214801 is 10841212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9985600 + 11229201 = 3160^2 + 3351^2 .

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 21214801 - 2⁷ = 21214673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214001) 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, 15975 + ... + 17251.

It is an arithmetic number, because the mean of its divisors is an integer number (2731725).

Almost surely, 2^21214801 is an apocalyptic number.

It is an amenable number.

21214801 is a deficient number, since it is larger than the sum of its proper divisors (638999).

21214801 is a wasteful number, since it uses less digits than its factorization.

21214801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21214801 is about 4605.9527787419. The cubic root of 21214801 is about 276.8298946476.

The spelling of 21214801 in words is "twenty-one million, two hundred fourteen thousand, eight hundred one".