223421991 has 32 divisors (see below), whose sum is σ = 332838912. Its totient is φ = 132382080.

The previous prime is 223421959. The next prime is 223422029. The reversal of 223421991 is 199124322.

It is not a de Polignac number, because 223421991 - 2⁵ = 223421959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223421911) 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 31 ways as a sum of consecutive naturals, for example, 341821 + ... + 342473.

It is an arithmetic number, because the mean of its divisors is an integer number (10401216).

Almost surely, 2^223421991 is an apocalyptic number.

223421991 is a deficient number, since it is larger than the sum of its proper divisors (109416921).

223421991 is a wasteful number, since it uses less digits than its factorization.

223421991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its digits is 7776, while the sum is 33.

The square root of 223421991 is about 14947.3071487810. The cubic root of 223421991 is about 606.7949706827.

The spelling of 223421991 in words is "two hundred twenty-three million, four hundred twenty-one thousand, nine hundred ninety-one".