212101220012021 has 24 divisors (see below), whose sum is σ = 215590914105216. Its totient is φ = 208665808464960.

The previous prime is 212101220012009. The next prime is 212101220012029. The reversal of 212101220012021 is 120210022101212.

It is not a de Polignac number, because 212101220012021 - 2⁶ = 212101220011957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101220012029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1566029321 + ... + 1566164753.

It is an arithmetic number, because the mean of its divisors is an integer number (8982954754384).

Almost surely, 2^{212101220012021} is an apocalyptic number.

It is an amenable number.

212101220012021 is a deficient number, since it is larger than the sum of its proper divisors (3489694093195).

212101220012021 is an equidigital number, since it uses as much as digits as its factorization.

212101220012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136553 (or 136470 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212101220012021 its reverse (120210022101212), we get a palindrome (332311242113233).

The spelling of 212101220012021 in words is "two hundred twelve trillion, one hundred one billion, two hundred twenty million, twelve thousand, twenty-one".