21010101102120 has 256 divisors, whose sum is σ = 69030806745600. Its totient is φ = 5084040867840.

The previous prime is 21010101102077. The next prime is 21010101102143. The reversal of 21010101102120 is 2120110101012.

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 = 21010101102096 and 21010101102105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169608366 + ... + 169732194.

It is an arithmetic number, because the mean of its divisors is an integer number (269651588850).

Almost surely, 2^{21010101102120} is an apocalyptic number.

21010101102120 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 21010101102120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34515403372800).

21010101102120 is an abundant number, since it is smaller than the sum of its proper divisors (48020705643480).

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

21010101102120 is a wasteful number, since it uses less digits than its factorization.

21010101102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125700 (or 125696 counting only the distinct ones).

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

Adding to 21010101102120 its reverse (2120110101012), we get a palindrome (23130211203132).

The spelling of 21010101102120 in words is "twenty-one trillion, ten billion, one hundred one million, one hundred two thousand, one hundred twenty".