1121201021 has 4 divisors (see below), whose sum is σ = 1121726844. Its totient is φ = 1120675200.

The previous prime is 1121200991. The next prime is 1121201023. The reversal of 1121201021 is 1201021211.

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 1050472921 + 70728100 = 32411^2 + 8410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121201021 - 2⁶ = 1121200957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121200993 and 1121201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121201023) 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, 259700 + ... + 263981.

It is an arithmetic number, because the mean of its divisors is an integer number (280431711).

Almost surely, 2^1121201021 is an apocalyptic number.

It is an amenable number.

1121201021 is a deficient number, since it is larger than the sum of its proper divisors (525823).

1121201021 is an equidigital number, since it uses as much as digits as its factorization.

1121201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525822.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1121201021 is about 33484.3399367525. The cubic root of 1121201021 is about 1038.8698957656.

Adding to 1121201021 its reverse (1201021211), we get a palindrome (2322222232).

The spelling of 1121201021 in words is "one billion, one hundred twenty-one million, two hundred one thousand, twenty-one".