21121122221110 has 8 divisors (see below), whose sum is σ = 38018019998016. Its totient is φ = 8448448888440.

The previous prime is 21121122221081. The next prime is 21121122221167. The reversal of 21121122221110 is 1112222112112.

It is a happy number.

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

It is a super-2 number, since 2×21121122221110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 1056056111046 + ... + 1056056111065.

It is an arithmetic number, because the mean of its divisors is an integer number (4752252499752).

Almost surely, 2^{21121122221110} is an apocalyptic number.

21121122221110 is a deficient number, since it is larger than the sum of its proper divisors (16896897776906).

21121122221110 is a wasteful number, since it uses less digits than its factorization.

21121122221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112112222118.

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

Adding to 21121122221110 its reverse (1112222112112), we get a palindrome (22233344333222).

The spelling of 21121122221110 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred ten".