1121001212021 has 4 divisors (see below), whose sum is σ = 1121198126412. Its totient is φ = 1120804297632.

The previous prime is 1121001211949. The next prime is 1121001212041. The reversal of 1121001212021 is 1202121001211.

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 55180359025 + 1065820852996 = 234905^2 + 1032386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121001212021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1121001211987 and 1121001212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121001212041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98448656 + ... + 98460041.

It is an arithmetic number, because the mean of its divisors is an integer number (280299531603).

Almost surely, 2^{1121001212021} is an apocalyptic number.

It is an amenable number.

1121001212021 is a deficient number, since it is larger than the sum of its proper divisors (196914391).

1121001212021 is an equidigital number, since it uses as much as digits as its factorization.

1121001212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196914390.

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

Adding to 1121001212021 its reverse (1202121001211), we get a palindrome (2323122213232).

The spelling of 1121001212021 in words is "one trillion, one hundred twenty-one billion, one million, two hundred twelve thousand, twenty-one".