221211010122221 has 24 divisors (see below), whose sum is σ = 258311690851776. Its totient is φ = 185571120343680.

The previous prime is 221211010122211. The next prime is 221211010122229. The reversal of 221211010122221 is 122221010112122.

It is not a de Polignac number, because 221211010122221 - 2¹⁸ = 221211009860077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211010122193 and 221211010122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211010122229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 854835365 + ... + 855094101.

It is an arithmetic number, because the mean of its divisors is an integer number (10762987118824).

Almost surely, 2^{221211010122221} is an apocalyptic number.

It is an amenable number.

221211010122221 is a deficient number, since it is larger than the sum of its proper divisors (37100680729555).

221211010122221 is an equidigital number, since it uses as much as digits as its factorization.

221211010122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314129 (or 314082 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221211010122221 its reverse (122221010112122), we get a palindrome (343432020234343).

The spelling of 221211010122221 in words is "two hundred twenty-one trillion, two hundred eleven billion, ten million, one hundred twenty-two thousand, two hundred twenty-one".