1204521011 has 4 divisors (see below), whose sum is σ = 1205068992. Its totient is φ = 1203973032.

The previous prime is 1204520981. The next prime is 1204521013. The reversal of 1204521011 is 1101254021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101254021 = 7 ⋅157322003.

It is a cyclic number.

It is not a de Polignac number, because 1204521011 - 2²⁶ = 1137412147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1204521013) 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, 270680 + ... + 275093.

It is an arithmetic number, because the mean of its divisors is an integer number (301267248).

Almost surely, 2^1204521011 is an apocalyptic number.

1204521011 is a deficient number, since it is larger than the sum of its proper divisors (547981).

1204521011 is an equidigital number, since it uses as much as digits as its factorization.

1204521011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547980.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1204521011 is about 34706.2099774666. The cubic root of 1204521011 is about 1063.9914220364.

Adding to 1204521011 its reverse (1101254021), we get a palindrome (2305775032).

The spelling of 1204521011 in words is "one billion, two hundred four million, five hundred twenty-one thousand, eleven".