2221213101221 has 8 divisors (see below), whose sum is σ = 2223615112320. Its totient is φ = 2218811527872.

The previous prime is 2221213101209. The next prime is 2221213101227. The reversal of 2221213101221 is 1221013121222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221213101221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221213101193 and 2221213101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221213101227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10609076 + ... + 10816418.

It is an arithmetic number, because the mean of its divisors is an integer number (277951889040).

Almost surely, 2^{2221213101221} is an apocalyptic number.

It is an amenable number.

2221213101221 is a deficient number, since it is larger than the sum of its proper divisors (2402011099).

2221213101221 is a wasteful number, since it uses less digits than its factorization.

2221213101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218875.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2221213101221 its reverse (1221013121222), we get a palindrome (3442226222443).

The spelling of 2221213101221 in words is "two trillion, two hundred twenty-one billion, two hundred thirteen million, one hundred one thousand, two hundred twenty-one".