21010112111021 has 8 divisors (see below), whose sum is σ = 22921505481504. Its totient is φ = 19098949270320.

The previous prime is 21010112110979. The next prime is 21010112111029. The reversal of 21010112111021 is 12011121101012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010112111021 - 2³⁰ = 21009038369197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010112110987 and 21010112111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010112111029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57441851 + ... + 57806456.

It is an arithmetic number, because the mean of its divisors is an integer number (2865188185188).

Almost surely, 2^{21010112111021} is an apocalyptic number.

It is an amenable number.

21010112111021 is a deficient number, since it is larger than the sum of its proper divisors (1911393370483).

21010112111021 is a wasteful number, since it uses less digits than its factorization.

21010112111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115264891.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21010112111021 its reverse (12011121101012), we get a palindrome (33021233212033).

The spelling of 21010112111021 in words is "twenty-one trillion, ten billion, one hundred twelve million, one hundred eleven thousand, twenty-one".