2111442521 has 4 divisors (see below), whose sum is σ = 2111534544. Its totient is φ = 2111350500.

The previous prime is 2111442511. The next prime is 2111442539. The reversal of 2111442521 is 1252441112.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111442521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111442511) 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, 19466 + ... + 67836.

It is an arithmetic number, because the mean of its divisors is an integer number (527883636).

Almost surely, 2^2111442521 is an apocalyptic number.

It is an amenable number.

2111442521 is a deficient number, since it is larger than the sum of its proper divisors (92023).

2111442521 is an equidigital number, since it uses as much as digits as its factorization.

2111442521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92022.

The product of its digits is 640, while the sum is 23.

The square root of 2111442521 is about 45950.4354821584. The cubic root of 2111442521 is about 1282.9008348781.

Adding to 2111442521 its reverse (1252441112), we get a palindrome (3363883633).

The spelling of 2111442521 in words is "two billion, one hundred eleven million, four hundred forty-two thousand, five hundred twenty-one".