221273399446 has 16 divisors (see below), whose sum is σ = 362091050640. Its totient is φ = 100576788480.

The previous prime is 221273399357. The next prime is 221273399447. The reversal of 221273399446 is 644993372122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221273399393 and 221273399402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221273399447) 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, 1833910 + ... + 1950838.

It is an arithmetic number, because the mean of its divisors is an integer number (22630690665).

Almost surely, 2^221273399446 is an apocalyptic number.

221273399446 is a deficient number, since it is larger than the sum of its proper divisors (140817651194).

221273399446 is a wasteful number, since it uses less digits than its factorization.

221273399446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202959.

The product of its digits is 3919104, while the sum is 52.

The spelling of 221273399446 in words is "two hundred twenty-one billion, two hundred seventy-three million, three hundred ninety-nine thousand, four hundred forty-six".