221213005540 has 48 divisors (see below), whose sum is σ = 465456801600. Its totient is φ = 88312113792.

The previous prime is 221213005501. The next prime is 221213005577. The reversal of 221213005540 is 45500312122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37701687 + ... + 37707553.

It is an arithmetic number, because the mean of its divisors is an integer number (9697016700).

Almost surely, 2^221213005540 is an apocalyptic number.

221213005540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221213005540 is an abundant number, since it is smaller than the sum of its proper divisors (244243796060).

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

221213005540 is a wasteful number, since it uses less digits than its factorization.

221213005540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9244 (or 9242 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 221213005540 its reverse (45500312122), we get a palindrome (266713317662).

The spelling of 221213005540 in words is "two hundred twenty-one billion, two hundred thirteen million, five thousand, five hundred forty".