21011121102020 has 192 divisors, whose sum is σ = 51884098269696. Its totient is φ = 6999365468160.

The previous prime is 21011121102011. The next prime is 21011121102047. The reversal of 21011121102020 is 2020112111012.

It is a super-3 number, since 3×21011121102020³ (a number of 41 digits) contains 333 as substring.

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 = 21011121101986 and 21011121102004.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 183361064 + ... + 183475616.

It is an arithmetic number, because the mean of its divisors is an integer number (270229678488).

Almost surely, 2^{21011121102020} is an apocalyptic number.

21011121102020 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 21011121102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25942049134848).

21011121102020 is an abundant number, since it is smaller than the sum of its proper divisors (30872977167676).

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

21011121102020 is a wasteful number, since it uses less digits than its factorization.

21011121102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114910 (or 114908 counting only the distinct ones).

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

Adding to 21011121102020 its reverse (2020112111012), we get a palindrome (23031233213032).

The spelling of 21011121102020 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, one hundred two thousand, twenty".