1021110220121 has 4 divisors (see below), whose sum is σ = 1065506316672. Its totient is φ = 976714123572.

The previous prime is 1021110220111. The next prime is 1021110220147. The reversal of 1021110220121 is 1210220111201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021110220121 - 2³⁰ = 1020036478297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021110220096 and 1021110220105.

It is not an unprimeable number, because it can be changed into a prime (1021110220111) 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, 22198048241 + ... + 22198048286.

It is an arithmetic number, because the mean of its divisors is an integer number (266376579168).

Almost surely, 2^{1021110220121} is an apocalyptic number.

It is an amenable number.

1021110220121 is a deficient number, since it is larger than the sum of its proper divisors (44396096551).

1021110220121 is an equidigital number, since it uses as much as digits as its factorization.

1021110220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44396096550.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021110220121 its reverse (1210220111201), we get a palindrome (2231330331322).

The spelling of 1021110220121 in words is "one trillion, twenty-one billion, one hundred ten million, two hundred twenty thousand, one hundred twenty-one".