21201121112020 has 24 divisors (see below), whose sum is σ = 46865636143200. Its totient is φ = 8034109052832.

The previous prime is 21201121111993. The next prime is 21201121112027. The reversal of 21201121112020 is 2021112110212.

It is a super-2 number, since 2×21201121112020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201121111985 and 21201121112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201121112027) 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, 27896211610 + ... + 27896212369.

It is an arithmetic number, because the mean of its divisors is an integer number (1952734839300).

Almost surely, 2^{21201121112020} is an apocalyptic number.

21201121112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201121112020 is an abundant number, since it is smaller than the sum of its proper divisors (25664515031180).

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

21201121112020 is a wasteful number, since it uses less digits than its factorization.

21201121112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55792424007 (or 55792424005 counting only the distinct ones).

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

Adding to 21201121112020 its reverse (2021112110212), we get a palindrome (23222233222232).

The spelling of 21201121112020 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-one million, one hundred twelve thousand, twenty".