21121111112110 has 8 divisors (see below), whose sum is σ = 38018000001816. Its totient is φ = 8448444444840.

The previous prime is 21121111112051. The next prime is 21121111112191. The reversal of 21121111112110 is 1121111112112.

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

It is a super-2 number, since 2×21121111112110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056055555596 + ... + 1056055555615.

It is an arithmetic number, because the mean of its divisors is an integer number (4752250000227).

Almost surely, 2^{21121111112110} is an apocalyptic number.

21121111112110 is a deficient number, since it is larger than the sum of its proper divisors (16896888889706).

21121111112110 is a wasteful number, since it uses less digits than its factorization.

21121111112110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112111111218.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 21121111112110 its reverse (1121111112112), we get a palindrome (22242222224222).

The spelling of 21121111112110 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, one hundred ten".