11523452021 has 8 divisors (see below), whose sum is σ = 11674517400. Its totient is φ = 11372866560.

The previous prime is 11523451937. The next prime is 11523452071. The reversal of 11523452021 is 12025432511.

It can be written as a sum of positive squares in 4 ways, for example, as 715562500 + 10807889521 = 26750^2 + 103961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11523452021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11523452071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71516 + ... + 167813.

It is an arithmetic number, because the mean of its divisors is an integer number (1459314675).

Almost surely, 2^11523452021 is an apocalyptic number.

It is an amenable number.

11523452021 is a deficient number, since it is larger than the sum of its proper divisors (151065379).

11523452021 is an equidigital number, since it uses as much as digits as its factorization.

11523452021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239959.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 11523452021 its reverse (12025432511), we get a palindrome (23548884532).

The spelling of 11523452021 in words is "eleven billion, five hundred twenty-three million, four hundred fifty-two thousand, twenty-one".