21013320144120 has 128 divisors (see below), whose sum is σ = 64419159168000. Its totient is φ = 5481097053696.

The previous prime is 21013320144083. The next prime is 21013320144143. The reversal of 21013320144120 is 2144102331012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8485902 + ... + 10678818.

It is an arithmetic number, because the mean of its divisors is an integer number (503274681000).

Almost surely, 2^{21013320144120} is an apocalyptic number.

21013320144120 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 21013320144120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32209579584000).

21013320144120 is an abundant number, since it is smaller than the sum of its proper divisors (43405839023880).

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

21013320144120 is a wasteful number, since it uses less digits than its factorization.

21013320144120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194677 (or 2194673 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21013320144120 its reverse (2144102331012), we get a palindrome (23157422475132).

The spelling of 21013320144120 in words is "twenty-one trillion, thirteen billion, three hundred twenty million, one hundred forty-four thousand, one hundred twenty".