11001221223421 has 16 divisors (see below), whose sum is σ = 12924618916608. Its totient is φ = 9231717412800.

The previous prime is 11001221223409. The next prime is 11001221223437. The reversal of 11001221223421 is 12432212210011.

11001221223421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11001221223421 - 2²³ = 11001212834813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001221223392 and 11001221223401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001221223401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22808211 + ... + 23285551.

It is an arithmetic number, because the mean of its divisors is an integer number (807788682288).

Almost surely, 2^{11001221223421} is an apocalyptic number.

11001221223421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001221223421 is a deficient number, since it is larger than the sum of its proper divisors (1923397693187).

11001221223421 is a wasteful number, since it uses less digits than its factorization.

11001221223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638532.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 11001221223421 its reverse (12432212210011), we get a palindrome (23433433433432).

The spelling of 11001221223421 in words is "eleven trillion, one billion, two hundred twenty-one million, two hundred twenty-three thousand, four hundred twenty-one".