21122122220012 has 12 divisors (see below), whose sum is σ = 40324051511016. Its totient is φ = 9600964645440.

The previous prime is 21122122220011. The next prime is 21122122220039. The reversal of 21122122220012 is 21002222122112.

It is a super-2 number, since 2×21122122220012² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122122220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240024116093 + ... + 240024116180.

It is an arithmetic number, because the mean of its divisors is an integer number (3360337625918).

Almost surely, 2^{21122122220012} is an apocalyptic number.

21122122220012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21122122220012 is a deficient number, since it is larger than the sum of its proper divisors (19201929291004).

21122122220012 is a wasteful number, since it uses less digits than its factorization.

21122122220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480048232288 (or 480048232286 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21122122220012 its reverse (21002222122112), we get a palindrome (42124344342124).

The spelling of 21122122220012 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-two million, two hundred twenty thousand, twelve".