221261346466 has 16 divisors (see below), whose sum is σ = 346348094400. Its totient is φ = 105812703568.

The previous prime is 221261346463. The next prime is 221261346497. The reversal of 221261346466 is 664643162122.

It is not an unprimeable number, because it can be changed into a prime (221261346463) 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, 463980 + ... + 811048.

It is an arithmetic number, because the mean of its divisors is an integer number (21646755900).

Almost surely, 2^221261346466 is an apocalyptic number.

221261346466 is a deficient number, since it is larger than the sum of its proper divisors (125086747934).

221261346466 is a wasteful number, since it uses less digits than its factorization.

221261346466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360953.

The product of its digits is 497664, while the sum is 43.

The spelling of 221261346466 in words is "two hundred twenty-one billion, two hundred sixty-one million, three hundred forty-six thousand, four hundred sixty-six".