1021120210111 has 4 divisors (see below), whose sum is σ = 1021464140400. Its totient is φ = 1020776279824.

The previous prime is 1021120210109. The next prime is 1021120210157. The reversal of 1021120210111 is 1110120211201.

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 1021120210111 - 2¹ = 1021120210109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021120210091 and 1021120210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120210711) 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, 171960691 + ... + 171966628.

It is an arithmetic number, because the mean of its divisors is an integer number (255366035100).

Almost surely, 2^{1021120210111} is an apocalyptic number.

1021120210111 is a deficient number, since it is larger than the sum of its proper divisors (343930289).

1021120210111 is an equidigital number, since it uses as much as digits as its factorization.

1021120210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343930288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1021120210111 its reverse (1110120211201), we get a palindrome (2131240421312).

The spelling of 1021120210111 in words is "one trillion, twenty-one billion, one hundred twenty million, two hundred ten thousand, one hundred eleven".