212000122231021 has 4 divisors (see below), whose sum is σ = 219310471273500. Its totient is φ = 204689773188544.

The previous prime is 212000122230983. The next prime is 212000122231087. The reversal of 212000122231021 is 120132221000212.

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 162386215317225 + 49613906913796 = 12743085^2 + 7043714^2 .

It is a cyclic number.

It is not a de Polignac number, because 212000122231021 - 2⁴¹ = 209801098975469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212000122231021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212000122231721) 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, 3655174521196 + ... + 3655174521253.

It is an arithmetic number, because the mean of its divisors is an integer number (54827617818375).

Almost surely, 2^{212000122231021} is an apocalyptic number.

It is an amenable number.

212000122231021 is a deficient number, since it is larger than the sum of its proper divisors (7310349042479).

212000122231021 is an equidigital number, since it uses as much as digits as its factorization.

212000122231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7310349042478.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 212000122231021 its reverse (120132221000212), we get a palindrome (332132343231233).

The spelling of 212000122231021 in words is "two hundred twelve trillion, one hundred twenty-two million, two hundred thirty-one thousand, twenty-one".