1011202021121 has 4 divisors (see below), whose sum is σ = 1011204121044. Its totient is φ = 1011199921200.

The previous prime is 1011202021097. The next prime is 1011202021243. The reversal of 1011202021121 is 1211202021101.

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 447668046400 + 563533974721 = 669080^2 + 750689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011202021121 - 2²² = 1011197826817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011202021096 and 1011202021105.

It is not an unprimeable number, because it can be changed into a prime (1011202023121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71951 + ... + 1423931.

It is an arithmetic number, because the mean of its divisors is an integer number (252801030261).

Almost surely, 2^{1011202021121} is an apocalyptic number.

It is an amenable number.

1011202021121 is a deficient number, since it is larger than the sum of its proper divisors (2099923).

1011202021121 is an equidigital number, since it uses as much as digits as its factorization.

1011202021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099922.

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

Adding to 1011202021121 its reverse (1211202021101), we get a palindrome (2222404042222).

The spelling of 1011202021121 in words is "one trillion, eleven billion, two hundred two million, twenty-one thousand, one hundred twenty-one".