21442023220411 has 4 divisors (see below), whose sum is σ = 21460179041424. Its totient is φ = 21423867399400.

The previous prime is 21442023220393. The next prime is 21442023220439. The reversal of 21442023220411 is 11402232024412.

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 21442023220411 - 2¹⁹ = 21442022696123 is a prime.

It is a super-2 number, since 2×21442023220411² (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 21442023220411.

It is not an unprimeable number, because it can be changed into a prime (21442023220451) 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, 9077908735 + ... + 9077911096.

It is an arithmetic number, because the mean of its divisors is an integer number (5365044760356).

Almost surely, 2^{21442023220411} is an apocalyptic number.

21442023220411 is a deficient number, since it is larger than the sum of its proper divisors (18155821013).

21442023220411 is a wasteful number, since it uses less digits than its factorization.

21442023220411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18155821012.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21442023220411 its reverse (11402232024412), we get a palindrome (32844255244823).

The spelling of 21442023220411 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, two hundred twenty thousand, four hundred eleven".