1211221020111 has 8 divisors (see below), whose sum is σ = 1615467471744. Its totient is φ = 807227624280.

The previous prime is 1211221020073. The next prime is 1211221020127. The reversal of 1211221020111 is 1110201221121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211221020111 - 2⁹ = 1211221019599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221020131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63252781 + ... + 63271926.

It is an arithmetic number, because the mean of its divisors is an integer number (201933433968).

Almost surely, 2^{1211221020111} is an apocalyptic number.

1211221020111 is a deficient number, since it is larger than the sum of its proper divisors (404246451633).

1211221020111 is a wasteful number, since it uses less digits than its factorization.

1211221020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126527901.

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

Adding to 1211221020111 its reverse (1110201221121), we get a palindrome (2321422241232).

The spelling of 1211221020111 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, twenty thousand, one hundred eleven".