21122021211020 has 24 divisors (see below), whose sum is σ = 44357365777200. Its totient is φ = 8448594916032.

The previous prime is 21122021210959. The next prime is 21122021211037. The reversal of 21122021211020 is 2011212022112.

It is a super-2 number, since 2×21122021211020² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122021211020.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12535835 + ... + 14120594.

It is an arithmetic number, because the mean of its divisors is an integer number (1848223574050).

Almost surely, 2^{21122021211020} is an apocalyptic number.

21122021211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122021211020 is an abundant number, since it is smaller than the sum of its proper divisors (23235344566180).

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

21122021211020 is a wasteful number, since it uses less digits than its factorization.

21122021211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26696057 (or 26696055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122021211020 its reverse (2011212022112), we get a palindrome (23133233233132).

The spelling of 21122021211020 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred eleven thousand, twenty".