11251711321 has 4 divisors (see below), whose sum is σ = 11387274192. Its totient is φ = 11116148452.

The previous prime is 11251711313. The next prime is 11251711333. The reversal of 11251711321 is 12311715211.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 11251711321 - 2³ = 11251711313 is a prime.

It is a super-2 number, since 2×11251711321² (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 (11251711301) 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, 67781311 + ... + 67781476.

It is an arithmetic number, because the mean of its divisors is an integer number (2846818548).

Almost surely, 2^11251711321 is an apocalyptic number.

It is an amenable number.

11251711321 is a deficient number, since it is larger than the sum of its proper divisors (135562871).

11251711321 is an equidigital number, since it uses as much as digits as its factorization.

11251711321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135562870.

The product of its digits is 420, while the sum is 25.

The spelling of 11251711321 in words is "eleven billion, two hundred fifty-one million, seven hundred eleven thousand, three hundred twenty-one".