11120021621 has 4 divisors (see below), whose sum is σ = 11120313792. Its totient is φ = 11119729452.

The previous prime is 11120021569. The next prime is 11120021641. The reversal of 11120021621 is 12612002111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12612002111 = 4663 ⋅2704697.

It is a cyclic number.

It is not a de Polignac number, because 11120021621 - 2¹⁸ = 11119759477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11120021621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11120021641) 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, 78605 + ... + 168578.

It is an arithmetic number, because the mean of its divisors is an integer number (2780078448).

Almost surely, 2^11120021621 is an apocalyptic number.

It is an amenable number.

11120021621 is a deficient number, since it is larger than the sum of its proper divisors (292171).

11120021621 is an equidigital number, since it uses as much as digits as its factorization.

11120021621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292170.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11120021621 its reverse (12612002111), we get a palindrome (23732023732).

The spelling of 11120021621 in words is "eleven billion, one hundred twenty million, twenty-one thousand, six hundred twenty-one".