212101210012021 has 16 divisors (see below), whose sum is σ = 244994634365760. Its totient is φ = 181476435329280.

The previous prime is 212101210011991. The next prime is 212101210012079. The reversal of 212101210012021 is 120210012101212.

It is a cyclic number.

It is not a de Polignac number, because 212101210012021 - 2¹³ = 212101210003829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212101210011986 and 212101210012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101210012621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70017550 + ... + 72983968.

It is an arithmetic number, because the mean of its divisors is an integer number (15312164647860).

Almost surely, 2^{212101210012021} is an apocalyptic number.

It is an amenable number.

212101210012021 is a deficient number, since it is larger than the sum of its proper divisors (32893424353739).

212101210012021 is a wasteful number, since it uses less digits than its factorization.

212101210012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348804.

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

Adding to 212101210012021 its reverse (120210012101212), we get a palindrome (332311222113233).

The spelling of 212101210012021 in words is "two hundred twelve trillion, one hundred one billion, two hundred ten million, twelve thousand, twenty-one".