212013320021 has 4 divisors (see below), whose sum is σ = 212030181792. Its totient is φ = 211996458252.

The previous prime is 212013319997. The next prime is 212013320053. The reversal of 212013320021 is 120023310212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212013320021 - 2¹⁸ = 212013057877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212013320221) 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, 8412011 + ... + 8437176.

It is an arithmetic number, because the mean of its divisors is an integer number (53007545448).

Almost surely, 2^212013320021 is an apocalyptic number.

It is an amenable number.

212013320021 is a deficient number, since it is larger than the sum of its proper divisors (16861771).

212013320021 is a wasteful number, since it uses less digits than its factorization.

212013320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16861770.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 212013320021 its reverse (120023310212), we get a palindrome (332036630233).

The spelling of 212013320021 in words is "two hundred twelve billion, thirteen million, three hundred twenty thousand, twenty-one".