21120100110021 has 24 divisors (see below), whose sum is σ = 30955396824352. Its totient is φ = 12799017396000.

The previous prime is 21120100110013. The next prime is 21120100110029. The reversal of 21120100110021 is 12001100102112.

It is an interprime number because it is at equal distance from previous prime (21120100110013) and next prime (21120100110029).

It is not a de Polignac number, because 21120100110021 - 2³ = 21120100110013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120100109979 and 21120100110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120100110029) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2100330 + ... + 6830196.

Almost surely, 2^{21120100110021} is an apocalyptic number.

It is an amenable number.

21120100110021 is a deficient number, since it is larger than the sum of its proper divisors (9835296714331).

21120100110021 is a wasteful number, since it uses less digits than its factorization.

21120100110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742193 (or 4742182 counting only the distinct ones).

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

Adding to 21120100110021 its reverse (12001100102112), we get a palindrome (33121200212133).

The spelling of 21120100110021 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, one hundred ten thousand, twenty-one".