21101221112020 has 24 divisors (see below), whose sum is σ = 50642930669184. Its totient is φ = 7234704381216.

The previous prime is 21101221111991. The next prime is 21101221112047. The reversal of 21101221112020 is 2021112210112.

It is a junction number, because it is equal to n+sod(n) for n = 21101221111985 and 21101221112003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75361503832 + ... + 75361504111.

It is an arithmetic number, because the mean of its divisors is an integer number (2110122111216).

Almost surely, 2^{21101221112020} is an apocalyptic number.

21101221112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101221112020 is an abundant number, since it is smaller than the sum of its proper divisors (29541709557164).

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

21101221112020 is a wasteful number, since it uses less digits than its factorization.

21101221112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150723007959 (or 150723007957 counting only the distinct ones).

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

Adding to 21101221112020 its reverse (2021112210112), we get a palindrome (23122333322132).

The spelling of 21101221112020 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, one hundred twelve thousand, twenty".