221745894402 has 8 divisors (see below), whose sum is σ = 443491788816. Its totient is φ = 73915298132.

The previous prime is 221745894313. The next prime is 221745894449. The reversal of 221745894402 is 204498547122.

It is a happy number.

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

221745894402 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18478824528 + ... + 18478824539.

It is an arithmetic number, because the mean of its divisors is an integer number (55436473602).

Almost surely, 2^221745894402 is an apocalyptic number.

221745894402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221745894402 is a wasteful number, since it uses less digits than its factorization.

221745894402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36957649072.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 221745894402 in words is "two hundred twenty-one billion, seven hundred forty-five million, eight hundred ninety-four thousand, four hundred two".