21221211220122 has 8 divisors (see below), whose sum is σ = 42442422440256. Its totient is φ = 7073737073372.

The previous prime is 21221211220073. The next prime is 21221211220151. The reversal of 21221211220122 is 22102211212212.

It is a sphenic number, since it is the product of 3 distinct primes.

21221211220122 is an admirable number.

It is a super-3 number, since 3×21221211220122³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768434268338 + ... + 1768434268349.

It is an arithmetic number, because the mean of its divisors is an integer number (5305302805032).

Almost surely, 2^{21221211220122} is an apocalyptic number.

21221211220122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21221211220122 is a wasteful number, since it uses less digits than its factorization.

21221211220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536868536692.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21221211220122 its reverse (22102211212212), we get a palindrome (43323422432334).

The spelling of 21221211220122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-two".