1121022157 has 4 divisors (see below), whose sum is σ = 1122688540. Its totient is φ = 1119355776.

The previous prime is 1121022131. The next prime is 1121022167. The reversal of 1121022157 is 7512201211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7512201211 = 20357 ⋅369023.

It can be written as a sum of positive squares in 2 ways, for example, as 169546441 + 951475716 = 13021^2 + 30846^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121022157 - 2¹⁹ = 1120497869 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 (1121022107) 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, 832182 + ... + 833527.

It is an arithmetic number, because the mean of its divisors is an integer number (280672135).

Almost surely, 2^1121022157 is an apocalyptic number.

It is an amenable number.

1121022157 is a deficient number, since it is larger than the sum of its proper divisors (1666383).

1121022157 is an equidigital number, since it uses as much as digits as its factorization.

1121022157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666382.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 1121022157 is about 33481.6689697512. The cubic root of 1121022157 is about 1038.8146495599.

Adding to 1121022157 its reverse (7512201211), we get a palindrome (8633223368).

The spelling of 1121022157 in words is "one billion, one hundred twenty-one million, twenty-two thousand, one hundred fifty-seven".