21121011112222 has 128 divisors (see below), whose sum is σ = 38913642086400. Its totient is φ = 8392110465024.

The previous prime is 21121011112207. The next prime is 21121011112247. The reversal of 21121011112222 is 22221111012112.

It is a happy number.

It is a super-2 number, since 2×21121011112222² (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 21121011112222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7315901263 + ... + 7315904149.

It is an arithmetic number, because the mean of its divisors is an integer number (304012828800).

Almost surely, 2^{21121011112222} is an apocalyptic number.

21121011112222 is a deficient number, since it is larger than the sum of its proper divisors (17792630974178).

21121011112222 is a wasteful number, since it uses less digits than its factorization.

21121011112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21121011112222 its reverse (22221111012112), we get a palindrome (43342122124334).

The spelling of 21121011112222 in words is "twenty-one trillion, one hundred twenty-one billion, eleven million, one hundred twelve thousand, two hundred twenty-two".