1121221523 has 4 divisors (see below), whose sum is σ = 1121348808. Its totient is φ = 1121094240.

The previous prime is 1121221513. The next prime is 1121221529. The reversal of 1121221523 is 3251221211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3251221211 = 7 ⋅464460173.

It is a cyclic number.

It is not a de Polignac number, because 1121221523 - 2⁶ = 1121221459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121221495 and 1121221504.

It is not an unprimeable number, because it can be changed into a prime (1121221529) 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, 49361 + ... + 68402.

It is an arithmetic number, because the mean of its divisors is an integer number (280337202).

Almost surely, 2^1121221523 is an apocalyptic number.

1121221523 is a deficient number, since it is larger than the sum of its proper divisors (127285).

1121221523 is an equidigital number, since it uses as much as digits as its factorization.

1121221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127284.

The product of its digits is 240, while the sum is 20.

The square root of 1121221523 is about 33484.6460784641. The cubic root of 1121221523 is about 1038.8762278983.

Adding to 1121221523 its reverse (3251221211), we get a palindrome (4372442734).

The spelling of 1121221523 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, five hundred twenty-three".