221541923 has 2 divisors, whose sum is σ = 221541924. Its totient is φ = 221541922.

The previous prime is 221541917. The next prime is 221541959. The reversal of 221541923 is 329145122.

221541923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221541923 - 2⁴ = 221541907 is a prime.

It is not a weakly prime, because it can be changed into another prime (221541913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110770961 + 110770962.

It is an arithmetic number, because the mean of its divisors is an integer number (110770962).

Almost surely, 2^221541923 is an apocalyptic number.

221541923 is a deficient number, since it is larger than the sum of its proper divisors (1).

221541923 is an equidigital number, since it uses as much as digits as its factorization.

221541923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 221541923 is about 14884.2844302304. The cubic root of 221541923 is about 605.0881396073.

The spelling of 221541923 in words is "two hundred twenty-one million, five hundred forty-one thousand, nine hundred twenty-three".