21122110020220 has 48 divisors (see below), whose sum is σ = 49301830757088. Its totient is φ = 7535847138560.

The previous prime is 21122110020173. The next prime is 21122110020227. The reversal of 21122110020220 is 2202001122112.

It is a happy number.

It is a super-2 number, since 2×21122110020220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122110020194 and 21122110020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122110020227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905739199 + ... + 905762518.

It is an arithmetic number, because the mean of its divisors is an integer number (1027121474106).

Almost surely, 2^{21122110020220} is an apocalyptic number.

21122110020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122110020220 is an abundant number, since it is smaller than the sum of its proper divisors (28179720736868).

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

21122110020220 is a wasteful number, since it uses less digits than its factorization.

21122110020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811501790 (or 1811501788 counting only the distinct ones).

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

Adding to 21122110020220 its reverse (2202001122112), we get a palindrome (23324111142332).

The spelling of 21122110020220 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred ten million, twenty thousand, two hundred twenty".