221206376872 has 128 divisors (see below), whose sum is σ = 507230035200. Its totient is φ = 89313988608.

The previous prime is 221206376851. The next prime is 221206376873. The reversal of 221206376872 is 278673602122.

It is a super-2 number, since 2×221206376872² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221206376873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1718253 + ... + 1842499.

It is an arithmetic number, because the mean of its divisors is an integer number (3962734650).

Almost surely, 2^221206376872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221206376872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253615017600).

221206376872 is an abundant number, since it is smaller than the sum of its proper divisors (286023658328).

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

221206376872 is a wasteful number, since it uses less digits than its factorization.

221206376872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124355 (or 124351 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

Adding to 221206376872 its reverse (278673602122), we get a palindrome (499879978994).

The spelling of 221206376872 in words is "two hundred twenty-one billion, two hundred six million, three hundred seventy-six thousand, eight hundred seventy-two".