213121434135 has 32 divisors (see below), whose sum is σ = 344223982080. Its totient is φ = 112588818048.

The previous prime is 213121434131. The next prime is 213121434181. The reversal of 213121434135 is 531434121312.

It is not a de Polignac number, because 213121434135 - 2² = 213121434131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121434131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6141744 + ... + 6176346.

It is an arithmetic number, because the mean of its divisors is an integer number (10756999440).

Almost surely, 2^213121434135 is an apocalyptic number.

213121434135 is a deficient number, since it is larger than the sum of its proper divisors (131102547945).

213121434135 is a wasteful number, since it uses less digits than its factorization.

213121434135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38487.

The product of its digits is 8640, while the sum is 30.

Adding to 213121434135 its reverse (531434121312), we get a palindrome (744555555447).

The spelling of 213121434135 in words is "two hundred thirteen billion, one hundred twenty-one million, four hundred thirty-four thousand, one hundred thirty-five".