21422111361 has 32 divisors (see below), whose sum is σ = 33496581888. Its totient is φ = 11922216960.

The previous prime is 21422111353. The next prime is 21422111387. The reversal of 21422111361 is 16311122412.

It is not a de Polignac number, because 21422111361 - 2³ = 21422111353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21422161361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489595 + ... + 531551.

It is an arithmetic number, because the mean of its divisors is an integer number (1046768184).

Almost surely, 2^21422111361 is an apocalyptic number.

21422111361 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21422111361 is a deficient number, since it is larger than the sum of its proper divisors (12074470527).

21422111361 is a wasteful number, since it uses less digits than its factorization.

21422111361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42601.

The product of its digits is 576, while the sum is 24.

Adding to 21422111361 its reverse (16311122412), we get a palindrome (37733233773).

The spelling of 21422111361 in words is "twenty-one billion, four hundred twenty-two million, one hundred eleven thousand, three hundred sixty-one".