221671671672 has 96 divisors (see below), whose sum is σ = 638052958080. Its totient is φ = 63637773120.

The previous prime is 221671671659. The next prime is 221671671701. The reversal of 221671671672 is 276176176122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1067668 + ... + 1258275.

It is an arithmetic number, because the mean of its divisors is an integer number (6646384980).

Almost surely, 2^221671671672 is an apocalyptic number.

221671671672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221671671672 is an abundant number, since it is smaller than the sum of its proper divisors (416381286408).

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

221671671672 is a wasteful number, since it uses less digits than its factorization.

221671671672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326001 (or 2325978 counting only the distinct ones).

The product of its digits is 592704, while the sum is 48.

The spelling of 221671671672 in words is "two hundred twenty-one billion, six hundred seventy-one million, six hundred seventy-one thousand, six hundred seventy-two".