11123132021 has 4 divisors (see below), whose sum is σ = 11123759532. Its totient is φ = 11122504512.

The previous prime is 11123131973. The next prime is 11123132029. The reversal of 11123132021 is 12023132111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7841102500 + 3282029521 = 88550^2 + 57289^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123132021 - 2²² = 11118937717 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 (11123132029) 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, 286370 + ... + 322883.

It is an arithmetic number, because the mean of its divisors is an integer number (2780939883).

Almost surely, 2^11123132021 is an apocalyptic number.

It is an amenable number.

11123132021 is a deficient number, since it is larger than the sum of its proper divisors (627511).

11123132021 is an equidigital number, since it uses as much as digits as its factorization.

11123132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627510.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11123132021 its reverse (12023132111), we get a palindrome (23146264132).

The spelling of 11123132021 in words is "eleven billion, one hundred twenty-three million, one hundred thirty-two thousand, twenty-one".