21210002011120 has 120 divisors (see below), whose sum is σ = 53425840572000. Its totient is φ = 7827357477888.

The previous prime is 21210002011069. The next prime is 21210002011129. The reversal of 21210002011120 is 2111020001212.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 21210002011120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210002011129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25948021 + ... + 26752939.

It is an arithmetic number, because the mean of its divisors is an integer number (445215338100).

Almost surely, 2^{21210002011120} is an apocalyptic number.

21210002011120 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 21210002011120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26712920286000).

21210002011120 is an abundant number, since it is smaller than the sum of its proper divisors (32215838560880).

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

21210002011120 is a wasteful number, since it uses less digits than its factorization.

21210002011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806907 (or 806888 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210002011120 its reverse (2111020001212), we get a palindrome (23321022012332).

The spelling of 21210002011120 in words is "twenty-one trillion, two hundred ten billion, two million, eleven thousand, one hundred twenty".