21926801 has 4 divisors (see below), whose sum is σ = 23613492. Its totient is φ = 20240112.

The previous prime is 21926783. The next prime is 21926803. The reversal of 21926801 is 10862912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5313025 + 16613776 = 2305^2 + 4076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21926801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21926803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843326 + ... + 843351.

It is an arithmetic number, because the mean of its divisors is an integer number (5903373).

Almost surely, 2^21926801 is an apocalyptic number.

It is an amenable number.

21926801 is a deficient number, since it is larger than the sum of its proper divisors (1686691).

21926801 is a wasteful number, since it uses less digits than its factorization.

21926801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686690.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21926801 is about 4682.6062187632. The cubic root of 21926801 is about 279.8928203731.

The spelling of 21926801 in words is "twenty-one million, nine hundred twenty-six thousand, eight hundred one".