213201232021 has 4 divisors (see below), whose sum is σ = 213209780652. Its totient is φ = 213192683392.

The previous prime is 213201232001. The next prime is 213201232037. The reversal of 213201232021 is 120232102312.

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 149893639921 + 63307592100 = 387161^2 + 251610^2 .

It is a cyclic number.

It is not a de Polignac number, because 213201232021 - 2¹⁷ = 213201100949 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 213201232021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213201232001) 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, 4236796 + ... + 4286821.

It is an arithmetic number, because the mean of its divisors is an integer number (53302445163).

Almost surely, 2^213201232021 is an apocalyptic number.

It is an amenable number.

213201232021 is a deficient number, since it is larger than the sum of its proper divisors (8548631).

213201232021 is an equidigital number, since it uses as much as digits as its factorization.

213201232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8548630.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 213201232021 its reverse (120232102312), we get a palindrome (333433334333).

The spelling of 213201232021 in words is "two hundred thirteen billion, two hundred one million, two hundred thirty-two thousand, twenty-one".