21112122121000 has 64 divisors (see below), whose sum is σ = 49609070784000. Its totient is φ = 8409514657600.

The previous prime is 21112122120923. The next prime is 21112122121049. The reversal of 21112122121000 is 12122121112.

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 15 ways as a sum of consecutive naturals, for example, 43928620 + ... + 44406619.

It is an arithmetic number, because the mean of its divisors is an integer number (775141731000).

Almost surely, 2^{21112122121000} is an apocalyptic number.

21112122121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112122121000 is an abundant number, since it is smaller than the sum of its proper divisors (28496948663000).

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

21112122121000 is a wasteful number, since it uses less digits than its factorization.

21112122121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88335499 (or 88335485 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21112122121000 its reverse (12122121112), we get a palindrome (21124244242112).

The spelling of 21112122121000 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand".