221672066890 has 16 divisors (see below), whose sum is σ = 399385809000. Its totient is φ = 88585251520.

The previous prime is 221672066881. The next prime is 221672066893. The reversal of 221672066890 is 98660276122.

221672066890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 117202837801 + 104469229089 = 342349^2 + 323217^2 .

It is not an unprimeable number, because it can be changed into a prime (221672066893) 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, 10435765 + ... + 10456984.

Almost surely, 2^221672066890 is an apocalyptic number.

221672066890 is a deficient number, since it is larger than the sum of its proper divisors (177713742110).

221672066890 is a wasteful number, since it uses less digits than its factorization.

221672066890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20893817.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 221672066890 in words is "two hundred twenty-one billion, six hundred seventy-two million, sixty-six thousand, eight hundred ninety".