21100011120021 has 32 divisors (see below), whose sum is σ = 29856178391040. Its totient is φ = 13226109019200.

The previous prime is 21100011119927. The next prime is 21100011120029. The reversal of 21100011120021 is 12002111000112.

It is not a de Polignac number, because 21100011120021 - 2¹⁰ = 21100011118997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100011119979 and 21100011120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100011120029) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 61018791 + ... + 61363611.

It is an arithmetic number, because the mean of its divisors is an integer number (933005574720).

Almost surely, 2^{21100011120021} is an apocalyptic number.

It is an amenable number.

21100011120021 is a deficient number, since it is larger than the sum of its proper divisors (8756167271019).

21100011120021 is a wasteful number, since it uses less digits than its factorization.

21100011120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359937.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21100011120021 its reverse (12002111000112), we get a palindrome (33102122120133).

The spelling of 21100011120021 in words is "twenty-one trillion, one hundred billion, eleven million, one hundred twenty thousand, twenty-one".