21303520542120 has 128 divisors (see below), whose sum is σ = 64268642954880. Its totient is φ = 5649114240000.

The previous prime is 21303520542097. The next prime is 21303520542127. The reversal of 21303520542120 is 2124502530312.

It is a super-4 number, since 4×21303520542120⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21303520542127) 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, 357285910 + ... + 357345530.

It is an arithmetic number, because the mean of its divisors is an integer number (502098773085).

Almost surely, 2^{21303520542120} is an apocalyptic number.

21303520542120 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 21303520542120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32134321477440).

21303520542120 is an abundant number, since it is smaller than the sum of its proper divisors (42965122412760).

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

21303520542120 is a wasteful number, since it uses less digits than its factorization.

21303520542120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76267 (or 76263 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21303520542120 in words is "twenty-one trillion, three hundred three billion, five hundred twenty million, five hundred forty-two thousand, one hundred twenty".