21364342120 has 192 divisors, whose sum is σ = 55184976000. Its totient is φ = 7381608960.

The previous prime is 21364342099. The next prime is 21364342123. The reversal of 21364342120 is 2124346312.

It is a happy number.

It is a super-2 number, since 2×21364342120² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21364342123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61215706 + ... + 61216054.

It is an arithmetic number, because the mean of its divisors is an integer number (287421750).

Almost surely, 2^21364342120 is an apocalyptic number.

21364342120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21364342120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27592488000).

21364342120 is an abundant number, since it is smaller than the sum of its proper divisors (33820633880).

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

21364342120 is a wasteful number, since it uses less digits than its factorization.

21364342120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21364342120 its reverse (2124346312), we get a palindrome (23488688432).

The spelling of 21364342120 in words is "twenty-one billion, three hundred sixty-four million, three hundred forty-two thousand, one hundred twenty".