212213233021 has 4 divisors (see below), whose sum is σ = 212215402044. Its totient is φ = 212211064000.

The previous prime is 212213232949. The next prime is 212213233049. The reversal of 212213233021 is 120332312212.

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 180698107396 + 31515125625 = 425086^2 + 177525^2 .

It is a cyclic number.

It is not a de Polignac number, because 212213233021 - 2¹⁹ = 212212708733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212213232983 and 212213233001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212213233721) 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, 930460 + ... + 1135861.

It is an arithmetic number, because the mean of its divisors is an integer number (53053850511).

Almost surely, 2^212213233021 is an apocalyptic number.

It is an amenable number.

212213233021 is a deficient number, since it is larger than the sum of its proper divisors (2169023).

212213233021 is a wasteful number, since it uses less digits than its factorization.

212213233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169022.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 212213233021 its reverse (120332312212), we get a palindrome (332545545233).

The spelling of 212213233021 in words is "two hundred twelve billion, two hundred thirteen million, two hundred thirty-three thousand, twenty-one".