213551320465 has 16 divisors (see below), whose sum is σ = 294977370240. Its totient is φ = 145381697280.

The previous prime is 213551320457. The next prime is 213551320481. The reversal of 213551320465 is 564023155312.

It is not a de Polignac number, because 213551320465 - 2³ = 213551320457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21942856 + ... + 21952585.

It is an arithmetic number, because the mean of its divisors is an integer number (18436085640).

Almost surely, 2^213551320465 is an apocalyptic number.

It is an amenable number.

213551320465 is a deficient number, since it is larger than the sum of its proper divisors (81426049775).

213551320465 is a wasteful number, since it uses less digits than its factorization.

213551320465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43895592.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 213551320465 its reverse (564023155312), we get a palindrome (777574475777).

The spelling of 213551320465 in words is "two hundred thirteen billion, five hundred fifty-one million, three hundred twenty thousand, four hundred sixty-five".