1121521045 has 16 divisors (see below), whose sum is σ = 1367740080. Its totient is φ = 882724864.

The previous prime is 1121521043. The next prime is 1121521057. The reversal of 1121521045 is 5401251211.

It can be written as a sum of positive squares in 8 ways, for example, as 307160676 + 814360369 = 17526^2 + 28537^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121521045 - 2¹ = 1121521043 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121521043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70161 + ... + 84649.

It is an arithmetic number, because the mean of its divisors is an integer number (85483755).

Almost surely, 2^1121521045 is an apocalyptic number.

It is an amenable number.

1121521045 is a deficient number, since it is larger than the sum of its proper divisors (246219035).

1121521045 is a wasteful number, since it uses less digits than its factorization.

1121521045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14744.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1121521045 is about 33489.1183072950. The cubic root of 1121521045 is about 1038.9687277820.

Adding to 1121521045 its reverse (5401251211), we get a palindrome (6522772256).

The spelling of 1121521045 in words is "one billion, one hundred twenty-one million, five hundred twenty-one thousand, forty-five".