11550541021 has 4 divisors (see below), whose sum is σ = 11555481600. Its totient is φ = 11545600444.

The previous prime is 11550541003. The next prime is 11550541063. The reversal of 11550541021 is 12014505511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12014505511 = 733 ⋅16390867.

It is a cyclic number.

It is not a de Polignac number, because 11550541021 - 2⁷ = 11550540893 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 (11550541091) 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, 2466781 + ... + 2471458.

It is an arithmetic number, because the mean of its divisors is an integer number (2888870400).

Almost surely, 2^11550541021 is an apocalyptic number.

It is an amenable number.

11550541021 is a deficient number, since it is larger than the sum of its proper divisors (4940579).

11550541021 is an equidigital number, since it uses as much as digits as its factorization.

11550541021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940578.

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 11550541021 in words is "eleven billion, five hundred fifty million, five hundred forty-one thousand, twenty-one".