21110121212020 has 24 divisors (see below), whose sum is σ = 44338862693664. Its totient is φ = 8442599313696.

The previous prime is 21110121211987. The next prime is 21110121212023. The reversal of 21110121212020 is 2021212101112.

It is a junction number, because it is equal to n+sod(n) for n = 21110121211985 and 21110121212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110121212023) 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, 90453742 + ... + 90686821.

It is an arithmetic number, because the mean of its divisors is an integer number (1847452612236).

Almost surely, 2^{21110121212020} is an apocalyptic number.

21110121212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110121212020 is an abundant number, since it is smaller than the sum of its proper divisors (23228741481644).

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

21110121212020 is a wasteful number, since it uses less digits than its factorization.

21110121212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181146399 (or 181146397 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21110121212020 its reverse (2021212101112), we get a palindrome (23131333313132).

The spelling of 21110121212020 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, two hundred twelve thousand, twenty".