21941801 has 4 divisors (see below), whose sum is σ = 25076352. Its totient is φ = 18807252.

The previous prime is 21941791. The next prime is 21941807. The reversal of 21941801 is 10814912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21941801 - 2⁶ = 21941737 is a prime.

It is a super-2 number, since 2×21941801² = 962885262247202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21941807) 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 3 ways as a sum of consecutive naturals, for example, 1567265 + ... + 1567278.

It is an arithmetic number, because the mean of its divisors is an integer number (6269088).

Almost surely, 2^21941801 is an apocalyptic number.

It is an amenable number.

21941801 is a deficient number, since it is larger than the sum of its proper divisors (3134551).

21941801 is an equidigital number, since it uses as much as digits as its factorization.

21941801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134550.

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

The square root of 21941801 is about 4684.2076170896. The cubic root of 21941801 is about 279.9566301875.

The spelling of 21941801 in words is "twenty-one million, nine hundred forty-one thousand, eight hundred one".