220221891 has 12 divisors (see below), whose sum is σ = 326696032. Its totient is φ = 142846416.

The previous prime is 220221889. The next prime is 220221949. The reversal of 220221891 is 198122022.

It is not a de Polignac number, because 220221891 - 2¹ = 220221889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220221821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 330331 + ... + 330996.

Almost surely, 2^220221891 is an apocalyptic number.

220221891 is a deficient number, since it is larger than the sum of its proper divisors (106474141).

220221891 is a wasteful number, since it uses less digits than its factorization.

220221891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661370 (or 661367 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 220221891 is about 14839.8750331666. The cubic root of 220221891 is about 603.8839621466.

It can be divided in two parts, 220 and 221891, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 220221891 in words is "two hundred twenty million, two hundred twenty-one thousand, eight hundred ninety-one".