213512534251 has 4 divisors (see below), whose sum is σ = 213540067152. Its totient is φ = 213485001352.

The previous prime is 213512534227. The next prime is 213512534269. The reversal of 213512534251 is 152435215312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213512534251 - 2⁹ = 213512533739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213512534051) 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, 13754815 + ... + 13770328.

It is an arithmetic number, because the mean of its divisors is an integer number (53385016788).

Almost surely, 2^213512534251 is an apocalyptic number.

213512534251 is a deficient number, since it is larger than the sum of its proper divisors (27532901).

213512534251 is an equidigital number, since it uses as much as digits as its factorization.

213512534251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27532900.

The product of its digits is 36000, while the sum is 34.

Adding to 213512534251 its reverse (152435215312), we get a palindrome (365947749563).

The spelling of 213512534251 in words is "two hundred thirteen billion, five hundred twelve million, five hundred thirty-four thousand, two hundred fifty-one".