21143342120 has 64 divisors (see below), whose sum is σ = 50113728000. Its totient is φ = 8006231808.

The previous prime is 21143342093. The next prime is 21143342137. The reversal of 21143342120 is 2124334112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1083974 + ... + 1103306.

It is an arithmetic number, because the mean of its divisors is an integer number (783027000).

Almost surely, 2^21143342120 is an apocalyptic number.

21143342120 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 21143342120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25056864000).

21143342120 is an abundant number, since it is smaller than the sum of its proper divisors (28970385880).

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

21143342120 is a wasteful number, since it uses less digits than its factorization.

21143342120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20802 (or 20798 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21143342120 its reverse (2124334112), we get a palindrome (23267676232).

The spelling of 21143342120 in words is "twenty-one billion, one hundred forty-three million, three hundred forty-two thousand, one hundred twenty".