213111331242021 has 8 divisors (see below), whose sum is σ = 315720490728960. Its totient is φ = 142074220827996.

The previous prime is 213111331241993. The next prime is 213111331242071. The reversal of 213111331242021 is 120242133111312.

213111331242021 is a `hidden beast` number, since 2 + 1 + 31 + 113 + 312 + 4 + 202 + 1 = 666.

It is not a de Polignac number, because 213111331242021 - 2⁵ = 213111331241989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7893012268223 = 213111331242021 / (2 + 1 + 3 + 1 + 1 + 1 + 3 + 3 + 1 + 2 + 4 + 2 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213111331242071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3946506134085 + ... + 3946506134138.

It is an arithmetic number, because the mean of its divisors is an integer number (39465061341120).

Almost surely, 2^{213111331242021} is an apocalyptic number.

It is an amenable number.

213111331242021 is a deficient number, since it is larger than the sum of its proper divisors (102609159486939).

213111331242021 is an equidigital number, since it uses as much as digits as its factorization.

213111331242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893012268232 (or 7893012268226 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 213111331242021 its reverse (120242133111312), we get a palindrome (333353464353333).

The spelling of 213111331242021 in words is "two hundred thirteen trillion, one hundred eleven billion, three hundred thirty-one million, two hundred forty-two thousand, twenty-one".