21224404102411 has 4 divisors (see below), whose sum is σ = 21224514553272. Its totient is φ = 21224293651552.

The previous prime is 21224404102361. The next prime is 21224404102459. The reversal of 21224404102411 is 11420140442212.

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

It is a cyclic number.

It is not a de Polignac number, because 21224404102411 - 2¹¹ = 21224404100363 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 21224404102411.

It is not an unprimeable number, because it can be changed into a prime (21224404102511) 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, 54936685 + ... + 55321678.

It is an arithmetic number, because the mean of its divisors is an integer number (5306128638318).

Almost surely, 2^{21224404102411} is an apocalyptic number.

21224404102411 is a deficient number, since it is larger than the sum of its proper divisors (110450861).

21224404102411 is a wasteful number, since it uses less digits than its factorization.

21224404102411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110450860.

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 21224404102411 its reverse (11420140442212), we get a palindrome (32644544544623).

The spelling of 21224404102411 in words is "twenty-one trillion, two hundred twenty-four billion, four hundred four million, one hundred two thousand, four hundred eleven".