11005442672421 has 4 divisors (see below), whose sum is σ = 14673923563232. Its totient is φ = 7336961781612.

The previous prime is 11005442672383. The next prime is 11005442672437. The reversal of 11005442672421 is 12427624450011.

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 not a de Polignac number, because 11005442672421 - 2¹⁰ = 11005442671397 is a prime.

It is a super-2 number, since 2×11005442672421² (a number of 27 digits) contains 22 as substring.

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 11005442672421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11005442672221) 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, 1834240445401 + ... + 1834240445406.

It is an arithmetic number, because the mean of its divisors is an integer number (3668480890808).

Almost surely, 2^{11005442672421} is an apocalyptic number.

It is an amenable number.

11005442672421 is a deficient number, since it is larger than the sum of its proper divisors (3668480890811).

11005442672421 is an equidigital number, since it uses as much as digits as its factorization.

11005442672421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668480890810.

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 11005442672421 in words is "eleven trillion, five billion, four hundred forty-two million, six hundred seventy-two thousand, four hundred twenty-one".