11621362511221 has 4 divisors (see below), whose sum is σ = 11891626755712. Its totient is φ = 11351098266732.

The previous prime is 11621362511219. The next prime is 11621362511257. The reversal of 11621362511221 is 12211526312611.

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 11621362511221 - 2¹ = 11621362511219 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 (11621362511821) 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, 135132122181 + ... + 135132122266.

It is an arithmetic number, because the mean of its divisors is an integer number (2972906688928).

Almost surely, 2^{11621362511221} is an apocalyptic number.

It is an amenable number.

11621362511221 is a deficient number, since it is larger than the sum of its proper divisors (270264244491).

11621362511221 is an equidigital number, since it uses as much as digits as its factorization.

11621362511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270264244490.

The product of its digits is 8640, while the sum is 34.

Adding to 11621362511221 its reverse (12211526312611), we get a palindrome (23832888823832).

The spelling of 11621362511221 in words is "eleven trillion, six hundred twenty-one billion, three hundred sixty-two million, five hundred eleven thousand, two hundred twenty-one".