221436541 has 16 divisors (see below), whose sum is σ = 232550208. Its totient is φ = 210672000.

The previous prime is 221436533. The next prime is 221436559. The reversal of 221436541 is 145634122.

It is a cyclic number.

It is not a de Polignac number, because 221436541 - 2³ = 221436533 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 (221436511) 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 15 ways as a sum of consecutive naturals, for example, 290601 + ... + 291361.

It is an arithmetic number, because the mean of its divisors is an integer number (14534388).

Almost surely, 2^221436541 is an apocalyptic number.

It is an amenable number.

221436541 is a deficient number, since it is larger than the sum of its proper divisors (11113667).

221436541 is a wasteful number, since it uses less digits than its factorization.

221436541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its digits is 5760, while the sum is 28.

The square root of 221436541 is about 14880.7439666167. The cubic root of 221436541 is about 604.9921825823.

The spelling of 221436541 in words is "two hundred twenty-one million, four hundred thirty-six thousand, five hundred forty-one".