1210211121111 has 8 divisors (see below), whose sum is σ = 1651140754560. Its totient is φ = 788044450872.

The previous prime is 1210211121037. The next prime is 1210211121157. The reversal of 1210211121111 is 1111211120121.

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

It is not a de Polignac number, because 1210211121111 - 2¹⁹ = 1210210596823 is a prime.

It is a super-2 number, since 2×1210211121111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210211121181) 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, 4690740651 + ... + 4690740908.

It is an arithmetic number, because the mean of its divisors is an integer number (206392594320).

Almost surely, 2^{1210211121111} is an apocalyptic number.

1210211121111 is a deficient number, since it is larger than the sum of its proper divisors (440929633449).

1210211121111 is an equidigital number, since it uses as much as digits as its factorization.

1210211121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9381481605.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1210211121111 its reverse (1111211120121), we get a palindrome (2321422241232).

The spelling of 1210211121111 in words is "one trillion, two hundred ten billion, two hundred eleven million, one hundred twenty-one thousand, one hundred eleven".