1020120022121 has 4 divisors (see below), whose sum is σ = 1020124804932. Its totient is φ = 1020115239312.

The previous prime is 1020120022069. The next prime is 1020120022147. The reversal of 1020120022121 is 1212200210201.

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 908437734400 + 111682287721 = 953120^2 + 334189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020120022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020120022096 and 1020120022105.

It is not an unprimeable number, because it can be changed into a prime (1020120072121) 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, 2055770 + ... + 2503283.

It is an arithmetic number, because the mean of its divisors is an integer number (255031201233).

Almost surely, 2^{1020120022121} is an apocalyptic number.

It is an amenable number.

1020120022121 is a deficient number, since it is larger than the sum of its proper divisors (4782811).

1020120022121 is an equidigital number, since it uses as much as digits as its factorization.

1020120022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782810.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020120022121 its reverse (1212200210201), we get a palindrome (2232320232322).

The spelling of 1020120022121 in words is "one trillion, twenty billion, one hundred twenty million, twenty-two thousand, one hundred twenty-one".