21344411121 has 32 divisors (see below), whose sum is σ = 33734676480. Its totient is φ = 11859825600.

The previous prime is 21344411107. The next prime is 21344411147. The reversal of 21344411121 is 12111444312.

It is a happy number.

It is not a de Polignac number, because 21344411121 - 2¹⁷ = 21344280049 is a prime.

It is a super-2 number, since 2×21344411121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21344411091 and 21344411100.

It is not an unprimeable number, because it can be changed into a prime (21344411021) 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, 529630 + ... + 568503.

It is an arithmetic number, because the mean of its divisors is an integer number (1054208640).

Almost surely, 2^21344411121 is an apocalyptic number.

It is an amenable number.

21344411121 is a deficient number, since it is larger than the sum of its proper divisors (12390265359).

21344411121 is a wasteful number, since it uses less digits than its factorization.

21344411121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098197.

The product of its digits is 768, while the sum is 24.

Adding to 21344411121 its reverse (12111444312), we get a palindrome (33455855433).

The spelling of 21344411121 in words is "twenty-one billion, three hundred forty-four million, four hundred eleven thousand, one hundred twenty-one".