21021020210120 has 192 divisors, whose sum is σ = 56550295307520. Its totient is φ = 6888496108032.

The previous prime is 21021020210093. The next prime is 21021020210129. The reversal of 21021020210120 is 2101202012012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21021020210095 and 21021020210104.

It is not an unprimeable number, because it can be changed into a prime (21021020210129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192945902 + ... + 193054818.

It is an arithmetic number, because the mean of its divisors is an integer number (294532788060).

Almost surely, 2^{21021020210120} is an apocalyptic number.

21021020210120 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 21021020210120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28275147653760).

21021020210120 is an abundant number, since it is smaller than the sum of its proper divisors (35529275097400).

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

21021020210120 is a wasteful number, since it uses less digits than its factorization.

21021020210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110284 (or 110257 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021020210120 its reverse (2101202012012), we get a palindrome (23122222222132).

The spelling of 21021020210120 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred ten thousand, one hundred twenty".