21194801 has 8 divisors (see below), whose sum is σ = 22494024. Its totient is φ = 19901440.

The previous prime is 21194783. The next prime is 21194819. The reversal of 21194801 is 10849112.

It is an interprime number because it is at equal distance from previous prime (21194783) and next prime (21194819).

It can be written as a sum of positive squares in 4 ways, for example, as 255025 + 20939776 = 505^2 + 4576^2 .

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-21194801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21194851) 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, 7661 + ... + 10053.

It is an arithmetic number, because the mean of its divisors is an integer number (2811753).

Almost surely, 2^21194801 is an apocalyptic number.

It is an amenable number.

21194801 is a deficient number, since it is larger than the sum of its proper divisors (1299223).

21194801 is a wasteful number, since it uses less digits than its factorization.

21194801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 21194801 is about 4603.7811633482. The cubic root of 21194801 is about 276.7428746050.

The spelling of 21194801 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred one".