21100220122012 has 6 divisors (see below), whose sum is σ = 36925385213528. Its totient is φ = 10550110061004.

The previous prime is 21100220121889. The next prime is 21100220122061. The reversal of 21100220122012 is 21022102200112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637527515248 + ... + 2637527515255.

Almost surely, 2^{21100220122012} is an apocalyptic number.

It is an amenable number.

21100220122012 is a deficient number, since it is larger than the sum of its proper divisors (15825165091516).

21100220122012 is a wasteful number, since it uses less digits than its factorization.

21100220122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275055030507 (or 5275055030505 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21100220122012 its reverse (21022102200112), we get a palindrome (42122322322124).

The spelling of 21100220122012 in words is "twenty-one trillion, one hundred billion, two hundred twenty million, one hundred twenty-two thousand, twelve".