1211022110221 has 24 divisors (see below), whose sum is σ = 1578345418944. Its totient is φ = 902625144960.

The previous prime is 1211022110173. The next prime is 1211022110237. The reversal of 1211022110221 is 1220112201121.

It is not a de Polignac number, because 1211022110221 - 2⁹ = 1211022109709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211022110195 and 1211022110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022110521) 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, 14824636 + ... + 14906101.

It is an arithmetic number, because the mean of its divisors is an integer number (65764392456).

Almost surely, 2^{1211022110221} is an apocalyptic number.

1211022110221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211022110221 is a deficient number, since it is larger than the sum of its proper divisors (367323308723).

1211022110221 is a wasteful number, since it uses less digits than its factorization.

1211022110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29730801 (or 29730778 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211022110221 its reverse (1220112201121), we get a palindrome (2431134311342).

The spelling of 1211022110221 in words is "one trillion, two hundred eleven billion, twenty-two million, one hundred ten thousand, two hundred twenty-one".