1020111112121 has 4 divisors (see below), whose sum is σ = 1030211222244. Its totient is φ = 1010011002000.

The previous prime is 1020111112093. The next prime is 1020111112157. The reversal of 1020111112121 is 1212111110201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 793524640000 + 226586472121 = 890800^2 + 476011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111112121 - 2⁶ = 1020111112057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020111112096 and 1020111112105.

It is not an unprimeable number, because it can be changed into a prime (1020111112021) 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, 5050054910 + ... + 5050055111.

It is an arithmetic number, because the mean of its divisors is an integer number (257552805561).

Almost surely, 2^{1020111112121} is an apocalyptic number.

It is an amenable number.

1020111112121 is a deficient number, since it is larger than the sum of its proper divisors (10100110123).

1020111112121 is a wasteful number, since it uses less digits than its factorization.

1020111112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100110122.

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

Adding to 1020111112121 its reverse (1212111110201), we get a palindrome (2232222222322).

The spelling of 1020111112121 in words is "one trillion, twenty billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".