21946801 has 4 divisors (see below), whose sum is σ = 21999600. Its totient is φ = 21894004.

The previous prime is 21946787. The next prime is 21946817. The reversal of 21946801 is 10864912.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-21946801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21946831) 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, 25771 + ... + 26608.

It is an arithmetic number, because the mean of its divisors is an integer number (5499900).

Almost surely, 2^21946801 is an apocalyptic number.

It is an amenable number.

21946801 is a deficient number, since it is larger than the sum of its proper divisors (52799).

21946801 is an equidigital number, since it uses as much as digits as its factorization.

21946801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52798.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21946801 is about 4684.7412948849. The cubic root of 21946801 is about 279.9778936629.

The spelling of 21946801 in words is "twenty-one million, nine hundred forty-six thousand, eight hundred one".