11217632621 has 4 divisors (see below), whose sum is σ = 12080527452. Its totient is φ = 10354737792.

The previous prime is 11217632599. The next prime is 11217632633. The reversal of 11217632621 is 12623671211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2889062500 + 8328570121 = 53750^2 + 91261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11217632621 - 2²⁶ = 11150523757 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 (11217632641) 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, 431447396 + ... + 431447421.

It is an arithmetic number, because the mean of its divisors is an integer number (3020131863).

Almost surely, 2^11217632621 is an apocalyptic number.

It is an amenable number.

11217632621 is a deficient number, since it is larger than the sum of its proper divisors (862894831).

11217632621 is an equidigital number, since it uses as much as digits as its factorization.

11217632621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862894830.

The product of its digits is 6048, while the sum is 32.

The spelling of 11217632621 in words is "eleven billion, two hundred seventeen million, six hundred thirty-two thousand, six hundred twenty-one".