21022111222020 has 144 divisors (see below), whose sum is σ = 67532680575360. Its totient is φ = 5282129369088.

The previous prime is 21022111222019. The next prime is 21022111222081. The reversal of 21022111222020 is 2022211122012.

It is a happy number.

21022111222020 is a `hidden beast` number, since 210 + 2 + 211 + 1 + 2 + 220 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21022111221984 and 21022111222002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37616685 + ... + 38171444.

It is an arithmetic number, because the mean of its divisors is an integer number (468976948440).

Almost surely, 2^{21022111222020} is an apocalyptic number.

21022111222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022111222020 is an abundant number, since it is smaller than the sum of its proper divisors (46510569353340).

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

21022111222020 is a wasteful number, since it uses less digits than its factorization.

21022111222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75788234 (or 75788229 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21022111222020 its reverse (2022211122012), we get a palindrome (23044322344032).

The spelling of 21022111222020 in words is "twenty-one trillion, twenty-two billion, one hundred eleven million, two hundred twenty-two thousand, twenty".