21121100222020 has 24 divisors (see below), whose sum is σ = 44355557764224. Its totient is φ = 8448202508256.

The previous prime is 21121100222009. The next prime is 21121100222041. The reversal of 21121100222020 is 2022200112112.

It is a happy number.

It is a super-2 number, since 2×21121100222020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121100221985 and 21121100222003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14118924 + ... + 15543043.

It is an arithmetic number, because the mean of its divisors is an integer number (1848148240176).

Almost surely, 2^{21121100222020} is an apocalyptic number.

21121100222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121100222020 is an abundant number, since it is smaller than the sum of its proper divisors (23234457542204).

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

21121100222020 is a wasteful number, since it uses less digits than its factorization.

21121100222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29697579 (or 29697577 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21121100222020 its reverse (2022200112112), we get a palindrome (23143300334132).

The spelling of 21121100222020 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred twenty-two thousand, twenty".