1211022330221 has 16 divisors (see below), whose sum is σ = 1333966330368. Its totient is φ = 1090227956400.

The previous prime is 1211022330143. The next prime is 1211022330223. The reversal of 1211022330221 is 1220332201121.

It is not a de Polignac number, because 1211022330221 - 2¹⁰ = 1211022329197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211022330193 and 1211022330202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022330223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2941166 + ... + 3327536.

It is an arithmetic number, because the mean of its divisors is an integer number (83372895648).

Almost surely, 2^{1211022330221} is an apocalyptic number.

1211022330221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211022330221 is a deficient number, since it is larger than the sum of its proper divisors (122944000147).

1211022330221 is a wasteful number, since it uses less digits than its factorization.

1211022330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389152.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1211022330221 its reverse (1220332201121), we get a palindrome (2431354531342).

The spelling of 1211022330221 in words is "one trillion, two hundred eleven billion, twenty-two million, three hundred thirty thousand, two hundred twenty-one".