1113421521 has 4 divisors (see below), whose sum is σ = 1484562032. Its totient is φ = 742281012.

The previous prime is 1113421483. The next prime is 1113421523. The reversal of 1113421521 is 1251243111.

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.

It is not a de Polignac number, because 1113421521 - 2⁹ = 1113421009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1113421523) 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, 185570251 + ... + 185570256.

It is an arithmetic number, because the mean of its divisors is an integer number (371140508).

Almost surely, 2^1113421521 is an apocalyptic number.

It is an amenable number.

1113421521 is a deficient number, since it is larger than the sum of its proper divisors (371140511).

1113421521 is an equidigital number, since it uses as much as digits as its factorization.

1113421521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371140510.

The product of its digits is 240, while the sum is 21.

The square root of 1113421521 is about 33367.9714846438. The cubic root of 1113421521 is about 1036.4615697046.

Adding to 1113421521 its reverse (1251243111), we get a palindrome (2364664632).

The spelling of 1113421521 in words is "one billion, one hundred thirteen million, four hundred twenty-one thousand, five hundred twenty-one".