11551340312221 has 8 divisors (see below), whose sum is σ = 11564482397184. Its totient is φ = 11538201224880.

The previous prime is 11551340312219. The next prime is 11551340312231. The reversal of 11551340312221 is 12221304315511.

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

It is a cyclic number.

It is not a de Polignac number, because 11551340312221 - 2¹ = 11551340312219 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 (11551340312231) 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, 7007595 + ... + 8497591.

It is an arithmetic number, because the mean of its divisors is an integer number (1445560299648).

Almost surely, 2^{11551340312221} is an apocalyptic number.

It is an amenable number.

11551340312221 is a deficient number, since it is larger than the sum of its proper divisors (13142084963).

11551340312221 is an equidigital number, since it uses as much as digits as its factorization.

11551340312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498811.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 11551340312221 its reverse (12221304315511), we get a palindrome (23772644627732).

The spelling of 11551340312221 in words is "eleven trillion, five hundred fifty-one billion, three hundred forty million, three hundred twelve thousand, two hundred twenty-one".