21220101122020 has 96 divisors (see below), whose sum is σ = 45946687852800. Its totient is φ = 8229329602560.

The previous prime is 21220101121997. The next prime is 21220101122027. The reversal of 21220101122020 is 2022110102212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21220101121985 and 21220101122003.

It is not an unprimeable number, because it can be changed into a prime (21220101122027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23674840 + ... + 24554800.

It is an arithmetic number, because the mean of its divisors is an integer number (478611331800).

Almost surely, 2^{21220101122020} is an apocalyptic number.

21220101122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220101122020 is an abundant number, since it is smaller than the sum of its proper divisors (24726586730780).

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

21220101122020 is a wasteful number, since it uses less digits than its factorization.

21220101122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880325 (or 880323 counting only the distinct ones).

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

Adding to 21220101122020 its reverse (2022110102212), we get a palindrome (23242211224232).

The spelling of 21220101122020 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred twenty-two thousand, twenty".