221801893 has 4 divisors (see below), whose sum is σ = 221851168. Its totient is φ = 221752620.

The previous prime is 221801891. The next prime is 221801897. The reversal of 221801893 is 398108122.

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 221801893 - 2¹ = 221801891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221801891) 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, 17121 + ... + 27142.

It is an arithmetic number, because the mean of its divisors is an integer number (55462792).

Almost surely, 2^221801893 is an apocalyptic number.

It is an amenable number.

221801893 is a deficient number, since it is larger than the sum of its proper divisors (49275).

221801893 is an equidigital number, since it uses as much as digits as its factorization.

221801893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49274.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 221801893 is about 14893.0149063244. The cubic root of 221801893 is about 605.3247287992.

The spelling of 221801893 in words is "two hundred twenty-one million, eight hundred one thousand, eight hundred ninety-three".