221220121222113 has 48 divisors (see below), whose sum is σ = 322959565748736. Its totient is φ = 133871965194240.

The previous prime is 221220121222039. The next prime is 221220121222129. The reversal of 221220121222113 is 311222121022122.

It is not a de Polignac number, because 221220121222113 - 2¹² = 221220121218017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220121222153) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 322988848 + ... + 323673038.

It is an arithmetic number, because the mean of its divisors is an integer number (6728324286432).

Almost surely, 2^{221220121222113} is an apocalyptic number.

It is an amenable number.

221220121222113 is a deficient number, since it is larger than the sum of its proper divisors (101739444526623).

221220121222113 is an equidigital number, since it uses as much as digits as its factorization.

221220121222113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684954 (or 684617 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 221220121222113 its reverse (311222121022122), we get a palindrome (532442242244235).

The spelling of 221220121222113 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred thirteen".