21221211012122 has 16 divisors (see below), whose sum is σ = 35201311420032. Its totient is φ = 9513867949920.

The previous prime is 21221211012121. The next prime is 21221211012139. The reversal of 21221211012122 is 22121011212212.

It is a junction number, because it is equal to n+sod(n) for n = 21221211012094 and 21221211012103.

It is not an unprimeable number, because it can be changed into a prime (21221211012121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6606851138 + ... + 6606854349.

It is an arithmetic number, because the mean of its divisors is an integer number (2200081963752).

Almost surely, 2^{21221211012122} is an apocalyptic number.

21221211012122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221211012122 is a deficient number, since it is larger than the sum of its proper divisors (13980100407910).

21221211012122 is a wasteful number, since it uses less digits than its factorization.

21221211012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13213705573.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21221211012122 its reverse (22121011212212), we get a palindrome (43342222224334).

The spelling of 21221211012122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, twelve thousand, one hundred twenty-two".