1020111121201 has 4 divisors (see below), whose sum is σ = 1021764462372. Its totient is φ = 1018457780032.

The previous prime is 1020111121199. The next prime is 1020111121217. The reversal of 1020111121201 is 1021211110201.

It is a happy number.

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 406514632225 + 613596488976 = 637585^2 + 783324^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111121201 - 2¹ = 1020111121199 is a prime.

It is a super-2 number, since 2×1020111121201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020111121801) 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, 826669660 + ... + 826670893.

It is an arithmetic number, because the mean of its divisors is an integer number (255441115593).

Almost surely, 2^{1020111121201} is an apocalyptic number.

It is an amenable number.

1020111121201 is a deficient number, since it is larger than the sum of its proper divisors (1653341171).

1020111121201 is an equidigital number, since it uses as much as digits as its factorization.

1020111121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653341170.

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

Adding to 1020111121201 its reverse (1021211110201), we get a palindrome (2041322231402).

The spelling of 1020111121201 in words is "one trillion, twenty billion, one hundred eleven million, one hundred twenty-one thousand, two hundred one".