221005438490 has 32 divisors (see below), whose sum is σ = 398553281280. Its totient is φ = 88237092544.

The previous prime is 221005438469. The next prime is 221005438499. The reversal of 221005438490 is 94834500122.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221005438499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15290447 + ... + 15304893.

It is an arithmetic number, because the mean of its divisors is an integer number (12454790040).

Almost surely, 2^221005438490 is an apocalyptic number.

221005438490 is a deficient number, since it is larger than the sum of its proper divisors (177547842790).

221005438490 is a wasteful number, since it uses less digits than its factorization.

221005438490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17206.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 221005438490 in words is "two hundred twenty-one billion, five million, four hundred thirty-eight thousand, four hundred ninety".