213012312022021 has 4 divisors (see below), whose sum is σ = 213048434176812. Its totient is φ = 212976189867232.

The previous prime is 213012312021979. The next prime is 213012312022177. The reversal of 213012312022021 is 120220213210312.

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 129227763529921 + 83784548492100 = 11367839^2 + 9153390^2 .

It is a cyclic number.

It is not a de Polignac number, because 213012312022021 - 2¹³ = 213012312013829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213012312021983 and 213012312022001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213012312022721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18061068550 + ... + 18061080343.

It is an arithmetic number, because the mean of its divisors is an integer number (53262108544203).

Almost surely, 2^{213012312022021} is an apocalyptic number.

It is an amenable number.

213012312022021 is a deficient number, since it is larger than the sum of its proper divisors (36122154791).

213012312022021 is an equidigital number, since it uses as much as digits as its factorization.

213012312022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36122154790.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 213012312022021 its reverse (120220213210312), we get a palindrome (333232525232333).

The spelling of 213012312022021 in words is "two hundred thirteen trillion, twelve billion, three hundred twelve million, twenty-two thousand, twenty-one".