11231322521 has 8 divisors (see below), whose sum is σ = 11494083744. Its totient is φ = 10968632640.

The previous prime is 11231322499. The next prime is 11231322547. The reversal of 11231322521 is 12522313211.

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

It is not a de Polignac number, because 11231322521 - 2¹⁸ = 11231060377 is a prime.

It is a super-2 number, since 2×11231322521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11231322551) 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, 431150 + ... + 456456.

It is an arithmetic number, because the mean of its divisors is an integer number (1436760468).

Almost surely, 2^11231322521 is an apocalyptic number.

It is an amenable number.

11231322521 is a deficient number, since it is larger than the sum of its proper divisors (262761223).

11231322521 is a wasteful number, since it uses less digits than its factorization.

11231322521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35671.

The product of its digits is 720, while the sum is 23.

Adding to 11231322521 its reverse (12522313211), we get a palindrome (23753635732).

The spelling of 11231322521 in words is "eleven billion, two hundred thirty-one million, three hundred twenty-two thousand, five hundred twenty-one".