11356214621 has 4 divisors (see below), whose sum is σ = 11398119744. Its totient is φ = 11314309500.

The previous prime is 11356214609. The next prime is 11356214641. The reversal of 11356214621 is 12641265311.

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 a de Polignac number, because none of the positive numbers 2^k-11356214621 is a prime.

It is a super-2 number, since 2×11356214621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11356214641) 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, 20952155 + ... + 20952696.

It is an arithmetic number, because the mean of its divisors is an integer number (2849529936).

Almost surely, 2^11356214621 is an apocalyptic number.

It is an amenable number.

11356214621 is a deficient number, since it is larger than the sum of its proper divisors (41905123).

11356214621 is an equidigital number, since it uses as much as digits as its factorization.

11356214621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41905122.

The product of its digits is 8640, while the sum is 32.

Adding to 11356214621 its reverse (12641265311), we get a palindrome (23997479932).

The spelling of 11356214621 in words is "eleven billion, three hundred fifty-six million, two hundred fourteen thousand, six hundred twenty-one".