1210221021111 has 4 divisors (see below), whose sum is σ = 1613628028152. Its totient is φ = 806814014072.

The previous prime is 1210221021077. The next prime is 1210221021157. The reversal of 1210221021111 is 1111201220121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1210221021111 - 2¹³ = 1210221012919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210221020111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201703503516 + ... + 201703503521.

It is an arithmetic number, because the mean of its divisors is an integer number (403407007038).

Almost surely, 2^{1210221021111} is an apocalyptic number.

1210221021111 is a deficient number, since it is larger than the sum of its proper divisors (403407007041).

1210221021111 is an equidigital number, since it uses as much as digits as its factorization.

1210221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403407007040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1210221021111 its reverse (1111201220121), we get a palindrome (2321422241232).

The spelling of 1210221021111 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".