21013030120 has 16 divisors (see below), whose sum is σ = 47279317860. Its totient is φ = 8405212032.

The previous prime is 21013030097. The next prime is 21013030123. The reversal of 21013030120 is 2103031012.

It can be written as a sum of positive squares in 2 ways, for example, as 20776916164 + 236113956 = 144142^2 + 15366^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21013030120.

It is not an unprimeable number, because it can be changed into a prime (21013030123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 262662837 + ... + 262662916.

Almost surely, 2^21013030120 is an apocalyptic number.

21013030120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013030120 is an abundant number, since it is smaller than the sum of its proper divisors (26266287740).

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

21013030120 is a wasteful number, since it uses less digits than its factorization.

21013030120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525325764 (or 525325760 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21013030120 its reverse (2103031012), we get a palindrome (23116061132).

The spelling of 21013030120 in words is "twenty-one billion, thirteen million, thirty thousand, one hundred twenty".