21293801 has 8 divisors (see below), whose sum is σ = 22566600. Its totient is φ = 20056960.

The previous prime is 21293777. The next prime is 21293803. The reversal of 21293801 is 10839212.

It can be written as a sum of positive squares in 4 ways, for example, as 179776 + 21114025 = 424^2 + 4595^2 .

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 21293801 - 2²² = 17099497 is a prime.

It is a super-2 number, since 2×21293801² = 906851922055202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21293803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7766 + ... + 10143.

It is an arithmetic number, because the mean of its divisors is an integer number (2820825).

Almost surely, 2^21293801 is an apocalyptic number.

It is an amenable number.

21293801 is a deficient number, since it is larger than the sum of its proper divisors (1272799).

21293801 is a wasteful number, since it uses less digits than its factorization.

21293801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17979.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21293801 is about 4614.5206684985. The cubic root of 21293801 is about 277.1730901306.

The spelling of 21293801 in words is "twenty-one million, two hundred ninety-three thousand, eight hundred one".