21010210012111 has 4 divisors (see below), whose sum is σ = 21010558564000. Its totient is φ = 21009861460224.

The previous prime is 21010210012063. The next prime is 21010210012171. The reversal of 21010210012111 is 11121001201012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21010210012111 - 2²¹ = 21010207914959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010210012091 and 21010210012100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010210012171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174185511 + ... + 174306088.

It is an arithmetic number, because the mean of its divisors is an integer number (5252639641000).

Almost surely, 2^{21010210012111} is an apocalyptic number.

21010210012111 is a deficient number, since it is larger than the sum of its proper divisors (348551889).

21010210012111 is an equidigital number, since it uses as much as digits as its factorization.

21010210012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348551888.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21010210012111 its reverse (11121001201012), we get a palindrome (32131211213123).

The spelling of 21010210012111 in words is "twenty-one trillion, ten billion, two hundred ten million, twelve thousand, one hundred eleven".