2126205761 has 4 divisors (see below), whose sum is σ = 2126530224. Its totient is φ = 2125881300.

The previous prime is 2126205709. The next prime is 2126205791. The reversal of 2126205761 is 1675026212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126205761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2126205791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152195 + ... + 165576.

It is an arithmetic number, because the mean of its divisors is an integer number (531632556).

Almost surely, 2^2126205761 is an apocalyptic number.

It is an amenable number.

2126205761 is a deficient number, since it is larger than the sum of its proper divisors (324463).

2126205761 is an equidigital number, since it uses as much as digits as its factorization.

2126205761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324462.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 2126205761 is about 46110.7987460638. The cubic root of 2126205761 is about 1285.8839141408.

The spelling of 2126205761 in words is "two billion, one hundred twenty-six million, two hundred five thousand, seven hundred sixty-one".