1020211111121 has 4 divisors (see below), whose sum is σ = 1020344079972. Its totient is φ = 1020078142272.

The previous prime is 1020211111111. The next prime is 1020211111201. The reversal of 1020211111121 is 1211111120201.

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 491311276096 + 528899835025 = 700936^2 + 727255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020211111121 - 2³⁰ = 1019137369297 is a prime.

It is a super-2 number, since 2×1020211111121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020211111096 and 1020211111105.

It is not an unprimeable number, because it can be changed into a prime (1020211111111) 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, 66472916 + ... + 66488261.

It is an arithmetic number, because the mean of its divisors is an integer number (255086019993).

Almost surely, 2^{1020211111121} is an apocalyptic number.

It is an amenable number.

1020211111121 is a deficient number, since it is larger than the sum of its proper divisors (132968851).

1020211111121 is an equidigital number, since it uses as much as digits as its factorization.

1020211111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132968850.

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

Adding to 1020211111121 its reverse (1211111120201), we get a palindrome (2231322231322).

The spelling of 1020211111121 in words is "one trillion, twenty billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".