21122010222220 has 48 divisors (see below), whose sum is σ = 44538752478528. Its totient is φ = 8414056304640.

The previous prime is 21122010222133. The next prime is 21122010222223. The reversal of 21122010222220 is 2222201022112.

It is a super-2 number, since 2×21122010222220² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122010222223) 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, 16297300 + ... + 17545540.

It is an arithmetic number, because the mean of its divisors is an integer number (927890676636).

Almost surely, 2^{21122010222220} is an apocalyptic number.

21122010222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122010222220 is an abundant number, since it is smaller than the sum of its proper divisors (23416742256308).

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

21122010222220 is a wasteful number, since it uses less digits than its factorization.

21122010222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251730 (or 1251728 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21122010222220 its reverse (2222201022112), we get a palindrome (23344211244332).

The spelling of 21122010222220 in words is "twenty-one trillion, one hundred twenty-two billion, ten million, two hundred twenty-two thousand, two hundred twenty".