21100121221012 has 48 divisors (see below), whose sum is σ = 39572489658240. Its totient is φ = 9808806643712.

The previous prime is 21100121221007. The next prime is 21100121221117. The reversal of 21100121221012 is 21012212100112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54933564 + ... + 55316332.

It is an arithmetic number, because the mean of its divisors is an integer number (824426867880).

Almost surely, 2^{21100121221012} is an apocalyptic number.

It is an amenable number.

21100121221012 is a deficient number, since it is larger than the sum of its proper divisors (18472368437228).

21100121221012 is a wasteful number, since it uses less digits than its factorization.

21100121221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392640 (or 392638 counting only the distinct ones).

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

Adding to 21100121221012 its reverse (21012212100112), we get a palindrome (42112333321124).

The spelling of 21100121221012 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".