21210101100120 has 128 divisors (see below), whose sum is σ = 64102544640000. Its totient is φ = 5614205160960.

The previous prime is 21210101100109. The next prime is 21210101100131. The reversal of 21210101100120 is 2100110101212.

It is an interprime number because it is at equal distance from previous prime (21210101100109) and next prime (21210101100131).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21210101100096 and 21210101100105.

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, 7535581 + ... + 9960179.

It is an arithmetic number, because the mean of its divisors is an integer number (500801130000).

Almost surely, 2^{21210101100120} is an apocalyptic number.

21210101100120 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 21210101100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32051272320000).

21210101100120 is an abundant number, since it is smaller than the sum of its proper divisors (42892443539880).

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

21210101100120 is a wasteful number, since it uses less digits than its factorization.

21210101100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425153 (or 2425149 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210101100120 its reverse (2100110101212), we get a palindrome (23310211201332).

The spelling of 21210101100120 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, one hundred thousand, one hundred twenty".