212100566465 has 4 divisors (see below), whose sum is σ = 254520679764. Its totient is φ = 169680453168.

The previous prime is 212100566443. The next prime is 212100566477. The reversal of 212100566465 is 564665001212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 167092095361 + 45008471104 = 408769^2 + 212152^2 .

It is a cyclic number.

It is not a de Polignac number, because 212100566465 - 2¹⁰ = 212100565441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21210056642 + ... + 21210056651.

It is an arithmetic number, because the mean of its divisors is an integer number (63630169941).

Almost surely, 2^212100566465 is an apocalyptic number.

It is an amenable number.

212100566465 is a deficient number, since it is larger than the sum of its proper divisors (42420113299).

212100566465 is an equidigital number, since it uses as much as digits as its factorization.

212100566465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42420113298.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 212100566465 its reverse (564665001212), we get a palindrome (776765567677).

The spelling of 212100566465 in words is "two hundred twelve billion, one hundred million, five hundred sixty-six thousand, four hundred sixty-five".