221407541 has 4 divisors (see below), whose sum is σ = 234431532. Its totient is φ = 208383552.

The previous prime is 221407531. The next prime is 221407577. The reversal of 221407541 is 145704122.

221407541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106296100 + 115111441 = 10310^2 + 10729^2 .

It is not a de Polignac number, because 221407541 - 2¹⁰ = 221406517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221407541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221407531) 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, 6511970 + ... + 6512003.

It is an arithmetic number, because the mean of its divisors is an integer number (58607883).

Almost surely, 2^221407541 is an apocalyptic number.

It is an amenable number.

221407541 is a deficient number, since it is larger than the sum of its proper divisors (13023991).

221407541 is a wasteful number, since it uses less digits than its factorization.

221407541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13023990.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 221407541 is about 14879.7695210645. The cubic root of 221407541 is about 604.9657708932.

The spelling of 221407541 in words is "two hundred twenty-one million, four hundred seven thousand, five hundred forty-one".