213621317522 has 54 divisors (see below), whose sum is σ = 343556814663. Its totient is φ = 99606587544.

The previous prime is 213621317519. The next prime is 213621317527. The reversal of 213621317522 is 225713126312.

It can be written as a sum of positive squares in only one way, i.e., 106810658761 + 106810658761 = 326819^2 + 326819^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=326819.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213621317527) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1279169483 + ... + 1279169649.

Almost surely, 2^213621317522 is an apocalyptic number.

213621317522 is a deficient number, since it is larger than the sum of its proper divisors (129935497141).

213621317522 is an equidigital number, since it uses as much as digits as its factorization.

213621317522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 291 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The spelling of 213621317522 in words is "two hundred thirteen billion, six hundred twenty-one million, three hundred seventeen thousand, five hundred twenty-two".