221213484377 has 16 divisors (see below), whose sum is σ = 227794727952. Its totient is φ = 214664693760.

The previous prime is 221213484341. The next prime is 221213484389. The reversal of 221213484377 is 773484312122.

It is a happy number.

221213484377 is digitally balanced in base 2, 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 8 ways, for example, as 102971033881 + 118242450496 = 320891^2 + 343864^2 .

It is not a de Polignac number, because 221213484377 - 2¹² = 221213480281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221213484397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25908053 + ... + 25916589.

It is an arithmetic number, because the mean of its divisors is an integer number (14237170497).

Almost surely, 2^221213484377 is an apocalyptic number.

It is an amenable number.

221213484377 is a deficient number, since it is larger than the sum of its proper divisors (6581243575).

221213484377 is a wasteful number, since it uses less digits than its factorization.

221213484377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10348.

The product of its digits is 451584, while the sum is 44.

Adding to 221213484377 its reverse (773484312122), we get a palindrome (994697796499).

The spelling of 221213484377 in words is "two hundred twenty-one billion, two hundred thirteen million, four hundred eighty-four thousand, three hundred seventy-seven".