212012011202021 has 4 divisors (see below), whose sum is σ = 212054236264044. Its totient is φ = 211969786140000.

The previous prime is 212012011201997. The next prime is 212012011202027. The reversal of 212012011202021 is 120202110210212.

212012011202021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 127909630761796 + 84102380440225 = 11309714^2 + 9170735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212012011202021 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 (212012011202027) 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, 21112523480 + ... + 21112533521.

It is an arithmetic number, because the mean of its divisors is an integer number (53013559066011).

Almost surely, 2^{212012011202021} is an apocalyptic number.

It is an amenable number.

212012011202021 is a deficient number, since it is larger than the sum of its proper divisors (42225062023).

212012011202021 is an equidigital number, since it uses as much as digits as its factorization.

212012011202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42225062022.

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

Adding to 212012011202021 its reverse (120202110210212), we get a palindrome (332214121412233).

The spelling of 212012011202021 in words is "two hundred twelve trillion, twelve billion, eleven million, two hundred two thousand, twenty-one".