212101110021 has 64 divisors (see below), whose sum is σ = 302852874240. Its totient is φ = 131798949120.

The previous prime is 212101110019. The next prime is 212101110097. The reversal of 212101110021 is 120011101212.

It is not a de Polignac number, because 212101110021 - 2¹ = 212101110019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212101109979 and 212101110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101110121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 168467290 + ... + 168468548.

It is an arithmetic number, because the mean of its divisors is an integer number (4732076160).

Almost surely, 2^212101110021 is an apocalyptic number.

It is an amenable number.

212101110021 is a deficient number, since it is larger than the sum of its proper divisors (90751764219).

212101110021 is a wasteful number, since it uses less digits than its factorization.

212101110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

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

Adding to 212101110021 its reverse (120011101212), we get a palindrome (332112211233).

The spelling of 212101110021 in words is "two hundred twelve billion, one hundred one million, one hundred ten thousand, twenty-one".