1021210111111 has 4 divisors (see below), whose sum is σ = 1022070440952. Its totient is φ = 1020349781272.

The previous prime is 1021210111091. The next prime is 1021210111121. The reversal of 1021210111111 is 1111110121201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021210111111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021210111091 and 1021210111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210111121) 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, 430163140 + ... + 430165513.

It is an arithmetic number, because the mean of its divisors is an integer number (255517610238).

Almost surely, 2^{1021210111111} is an apocalyptic number.

1021210111111 is a deficient number, since it is larger than the sum of its proper divisors (860329841).

1021210111111 is an equidigital number, since it uses as much as digits as its factorization.

1021210111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860329840.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1021210111111 its reverse (1111110121201), we get a palindrome (2132320232312).

The spelling of 1021210111111 in words is "one trillion, twenty-one billion, two hundred ten million, one hundred eleven thousand, one hundred eleven".