221072723121 has 48 divisors (see below), whose sum is σ = 319486204800. Its totient is φ = 135814901376.

The previous prime is 221072723089. The next prime is 221072723141. The reversal of 221072723121 is 121327270122.

It is a happy number.

It is not a de Polignac number, because 221072723121 - 2⁵ = 221072723089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221072723141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483747525 + ... + 483747981.

It is an arithmetic number, because the mean of its divisors is an integer number (6655962600).

Almost surely, 2^221072723121 is an apocalyptic number.

It is an amenable number.

221072723121 is a deficient number, since it is larger than the sum of its proper divisors (98413481679).

221072723121 is an frugal number, since it uses more digits than its factorization.

221072723121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 221072723121 its reverse (121327270122), we get a palindrome (342399993243).

The spelling of 221072723121 in words is "two hundred twenty-one billion, seventy-two million, seven hundred twenty-three thousand, one hundred twenty-one".