21222122020 has 48 divisors (see below), whose sum is σ = 49099369536. Its totient is φ = 7640720000.

The previous prime is 21222121993. The next prime is 21222122027. The reversal of 21222122020 is 2022122212.

It is a junction number, because it is equal to n+sod(n) for n = 21222121985 and 21222122003.

It is not an unprimeable number, because it can be changed into a prime (21222122027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455326 + ... + 499765.

It is an arithmetic number, because the mean of its divisors is an integer number (1022903532).

Almost surely, 2^21222122020 is an apocalyptic number.

21222122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222122020 is an abundant number, since it is smaller than the sum of its proper divisors (27877247516).

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

21222122020 is a wasteful number, since it uses less digits than its factorization.

21222122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955212 (or 955210 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222122020 its reverse (2022122212), we get a palindrome (23244244232).

The spelling of 21222122020 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, twenty".