21002100121122 has 8 divisors (see below), whose sum is σ = 42004200242256. Its totient is φ = 7000700040372.

The previous prime is 21002100121081. The next prime is 21002100121127. The reversal of 21002100121122 is 22112100120012.

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

21002100121122 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21002100121127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750175010088 + ... + 1750175010099.

It is an arithmetic number, because the mean of its divisors is an integer number (5250525030282).

Almost surely, 2^{21002100121122} is an apocalyptic number.

21002100121122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21002100121122 is a wasteful number, since it uses less digits than its factorization.

21002100121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500350020192.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002100121122 its reverse (22112100120012), we get a palindrome (43114200241134).

The spelling of 21002100121122 in words is "twenty-one trillion, two billion, one hundred million, one hundred twenty-one thousand, one hundred twenty-two".