21011021201120 has 48 divisors (see below), whose sum is σ = 50379411308688. Its totient is φ = 8278969543680.

The previous prime is 21011021201111. The next prime is 21011021201123. The reversal of 21011021201120 is 2110212011012.

It is a junction number, because it is equal to n+sod(n) for n = 21011021201095 and 21011021201104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011021201123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979980941 + ... + 980002380.

It is an arithmetic number, because the mean of its divisors is an integer number (1049571068931).

Almost surely, 2^{21011021201120} is an apocalyptic number.

21011021201120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011021201120 is an abundant number, since it is smaller than the sum of its proper divisors (29368390107568).

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

21011021201120 is a wasteful number, since it uses less digits than its factorization.

21011021201120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959983403 (or 1959983395 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011021201120 its reverse (2110212011012), we get a palindrome (23121233212132).

The spelling of 21011021201120 in words is "twenty-one trillion, eleven billion, twenty-one million, two hundred one thousand, one hundred twenty".