213056215246021 has 48 divisors (see below), whose sum is σ = 256296414472560. Its totient is φ = 176474858112000.

The previous prime is 213056215246009. The next prime is 213056215246057. The reversal of 213056215246021 is 120642512650312.

It can be written as a sum of positive squares in 8 ways, for example, as 9542452315396 + 203513762930625 = 3089086^2 + 14265825^2 .

It is not a de Polignac number, because 213056215246021 - 2¹⁹ = 213056214721733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213056215246921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 696425631 + ... + 696731491.

It is an arithmetic number, because the mean of its divisors is an integer number (5339508634845).

Almost surely, 2^{213056215246021} is an apocalyptic number.

It is an amenable number.

213056215246021 is a deficient number, since it is larger than the sum of its proper divisors (43240199226539).

213056215246021 is a wasteful number, since it uses less digits than its factorization.

213056215246021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309206 (or 309199 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

Adding to 213056215246021 its reverse (120642512650312), we get a palindrome (333698727896333).

The spelling of 213056215246021 in words is "two hundred thirteen trillion, fifty-six billion, two hundred fifteen million, two hundred forty-six thousand, twenty-one".