1121031131221 has 4 divisors (see below), whose sum is σ = 1121232869932. Its totient is φ = 1120829392512.

The previous prime is 1121031131111. The next prime is 1121031131249. The reversal of 1121031131221 is 1221311301211.

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 773740140625 + 347290990596 = 879625^2 + 589314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121031131221 - 2⁷ = 1121031131093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121031131251) 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, 100861020 + ... + 100872133.

It is an arithmetic number, because the mean of its divisors is an integer number (280308217483).

Almost surely, 2^{1121031131221} is an apocalyptic number.

It is an amenable number.

1121031131221 is a deficient number, since it is larger than the sum of its proper divisors (201738711).

1121031131221 is an equidigital number, since it uses as much as digits as its factorization.

1121031131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201738710.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1121031131221 its reverse (1221311301211), we get a palindrome (2342342432432).

The spelling of 1121031131221 in words is "one trillion, one hundred twenty-one billion, thirty-one million, one hundred thirty-one thousand, two hundred twenty-one".