213551320505 has 8 divisors (see below), whose sum is σ = 256373161992. Its totient is φ = 170766671488.

The previous prime is 213551320487. The next prime is 213551320519. The reversal of 213551320505 is 505023155312.

It can be written as a sum of positive squares in 4 ways, for example, as 20482475689 + 193068844816 = 143117^2 + 439396^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213551320505 - 2¹² = 213551316409 is a prime.

It is a super-3 number, since 3×213551320505³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9285482 + ... + 9308451.

It is an arithmetic number, because the mean of its divisors is an integer number (32046645249).

Almost surely, 2^213551320505 is an apocalyptic number.

It is an amenable number.

213551320505 is a deficient number, since it is larger than the sum of its proper divisors (42821841487).

213551320505 is a wasteful number, since it uses less digits than its factorization.

213551320505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18596235.

The product of its (nonzero) digits is 22500, while the sum is 32.

Adding to 213551320505 its reverse (505023155312), we get a palindrome (718574475817).

The spelling of 213551320505 in words is "two hundred thirteen billion, five hundred fifty-one million, three hundred twenty thousand, five hundred five".