221082405 has 8 divisors (see below), whose sum is σ = 353731872. Its totient is φ = 117910608.

The previous prime is 221082403. The next prime is 221082431. The reversal of 221082405 is 504280122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221082405 - 2¹ = 221082403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221082401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7369399 + ... + 7369428.

It is an arithmetic number, because the mean of its divisors is an integer number (44216484).

Almost surely, 2^221082405 is an apocalyptic number.

It is an amenable number.

221082405 is a deficient number, since it is larger than the sum of its proper divisors (132649467).

221082405 is a wasteful number, since it uses less digits than its factorization.

221082405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14738835.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 221082405 is about 14868.8400690841. The cubic root of 221082405 is about 604.6694959619.

The spelling of 221082405 in words is "two hundred twenty-one million, eighty-two thousand, four hundred five".