21884901 has 8 divisors (see below), whose sum is σ = 29218464. Its totient is φ = 14570640.

The previous prime is 21884897. The next prime is 21884917. The reversal of 21884901 is 10948812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21884901 - 2² = 21884897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1930 + ... + 6891.

It is an arithmetic number, because the mean of its divisors is an integer number (3652308).

Almost surely, 2^21884901 is an apocalyptic number.

It is an amenable number.

21884901 is a deficient number, since it is larger than the sum of its proper divisors (7333563).

21884901 is an equidigital number, since it uses as much as digits as its factorization.

21884901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9651.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 21884901 is about 4678.1300751475. The cubic root of 21884901 is about 279.7144239720.

The spelling of 21884901 in words is "twenty-one million, eight hundred eighty-four thousand, nine hundred one".