2126216465 has 4 divisors (see below), whose sum is σ = 2551459764. Its totient is φ = 1700973168.

The previous prime is 2126216447. The next prime is 2126216471. The reversal of 2126216465 is 5646126212.

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 401641681 + 1724574784 = 20041^2 + 41528^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126216465 - 2¹⁸ = 2125954321 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, 212621642 + ... + 212621651.

It is an arithmetic number, because the mean of its divisors is an integer number (637864941).

Almost surely, 2^2126216465 is an apocalyptic number.

It is an amenable number.

2126216465 is a deficient number, since it is larger than the sum of its proper divisors (425243299).

2126216465 is an equidigital number, since it uses as much as digits as its factorization.

2126216465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425243298.

The product of its digits is 34560, while the sum is 35.

The square root of 2126216465 is about 46110.9148141739. The cubic root of 2126216465 is about 1285.8860719876.

The spelling of 2126216465 in words is "two billion, one hundred twenty-six million, two hundred sixteen thousand, four hundred sixty-five".