1021210211111 has 4 divisors (see below), whose sum is σ = 1044959285832. Its totient is φ = 997461136392.

The previous prime is 1021210211069. The next prime is 1021210211171. The reversal of 1021210211111 is 1111120121201.

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 1021210211111 - 2³⁴ = 1004030341927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210211171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11874537296 + ... + 11874537381.

It is an arithmetic number, because the mean of its divisors is an integer number (261239821458).

Almost surely, 2^{1021210211111} is an apocalyptic number.

1021210211111 is a deficient number, since it is larger than the sum of its proper divisors (23749074721).

1021210211111 is an equidigital number, since it uses as much as digits as its factorization.

1021210211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23749074720.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1021210211111 its reverse (1111120121201), we get a palindrome (2132330332312).

It can be divided in two parts, 1021210 and 211111, that added together give a palindrome (1232321).

The spelling of 1021210211111 in words is "one trillion, twenty-one billion, two hundred ten million, two hundred eleven thousand, one hundred eleven".