221278012060 has 48 divisors (see below), whose sum is σ = 531758082240. Its totient is φ = 75768053760.

The previous prime is 221278012019. The next prime is 221278012061. The reversal of 221278012060 is 60210872122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221278012061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920011 + ... + 1135330.

It is an arithmetic number, because the mean of its divisors is an integer number (11078293380).

Almost surely, 2^221278012060 is an apocalyptic number.

221278012060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221278012060 is an abundant number, since it is smaller than the sum of its proper divisors (310480070180).

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

221278012060 is a wasteful number, since it uses less digits than its factorization.

221278012060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056126 (or 2056124 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 221278012060 its reverse (60210872122), we get a palindrome (281488884182).

The spelling of 221278012060 in words is "two hundred twenty-one billion, two hundred seventy-eight million, twelve thousand, sixty".