21121110022222 has 24 divisors (see below), whose sum is σ = 36854375072040. Its totient is φ = 9051856818480.

The previous prime is 21121110022211. The next prime is 21121110022351. The reversal of 21121110022222 is 22222001112112.

It is a super-2 number, since 2×21121110022222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121110022222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23352472 + ... + 24240052.

It is an arithmetic number, because the mean of its divisors is an integer number (1535598961335).

Almost surely, 2^{21121110022222} is an apocalyptic number.

21121110022222 is a deficient number, since it is larger than the sum of its proper divisors (15733265049818).

21121110022222 is a wasteful number, since it uses less digits than its factorization.

21121110022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130416 (or 1130409 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21121110022222 its reverse (22222001112112), we get a palindrome (43343111134334).

The spelling of 21121110022222 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, twenty-two thousand, two hundred twenty-two".