21002112112021 has 8 divisors (see below), whose sum is σ = 21166886456064. Its totient is φ = 20837836329840.

The previous prime is 21002112111889. The next prime is 21002112112031. The reversal of 21002112112021 is 12021121120012.

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 21002112112021 - 2¹¹ = 21002112109973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002112111986 and 21002112112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002112112031) 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, 124555885 + ... + 124724386.

It is an arithmetic number, because the mean of its divisors is an integer number (2645860807008).

Almost surely, 2^{21002112112021} is an apocalyptic number.

It is an amenable number.

21002112112021 is a deficient number, since it is larger than the sum of its proper divisors (164774344043).

21002112112021 is a wasteful number, since it uses less digits than its factorization.

21002112112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249280931.

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

Adding to 21002112112021 its reverse (12021121120012), we get a palindrome (33023233232033).

The spelling of 21002112112021 in words is "twenty-one trillion, two billion, one hundred twelve million, one hundred twelve thousand, twenty-one".