21144340120 has 32 divisors (see below), whose sum is σ = 48681159120. Its totient is φ = 8261043840.

The previous prime is 21144340117. The next prime is 21144340141. The reversal of 21144340120 is 2104344112.

It is a happy number.

It is a super-2 number, since 2×21144340120² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21144340091 and 21144340100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6144891 + ... + 6148330.

Almost surely, 2^21144340120 is an apocalyptic number.

21144340120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144340120 is an abundant number, since it is smaller than the sum of its proper divisors (27536819000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144340120 is a wasteful number, since it uses less digits than its factorization.

21144340120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12293275 (or 12293271 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21144340120 its reverse (2104344112), we get a palindrome (23248684232).

The spelling of 21144340120 in words is "twenty-one billion, one hundred forty-four million, three hundred forty thousand, one hundred twenty".