20012521127765 has 4 divisors (see below), whose sum is σ = 24015025353324. Its totient is φ = 16010016902208.

The previous prime is 20012521127719. The next prime is 20012521127791. The reversal of 20012521127765 is 56772112521002.

It is a happy number.

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 2726068468561 + 17286452659204 = 1651081^2 + 4157698^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012521127765 - 2¹⁸ = 20012520865621 is a prime.

It is a Duffinian number.

It is a congruent 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, 2001252112772 + ... + 2001252112781.

It is an arithmetic number, because the mean of its divisors is an integer number (6003756338331).

Almost surely, 2^{20012521127765} is an apocalyptic number.

It is an amenable number.

20012521127765 is a deficient number, since it is larger than the sum of its proper divisors (4002504225559).

20012521127765 is an equidigital number, since it uses as much as digits as its factorization.

20012521127765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002504225558.

The product of its (nonzero) digits is 117600, while the sum is 41.

Adding to 20012521127765 its reverse (56772112521002), we get a palindrome (76784633648767).

The spelling of 20012521127765 in words is "twenty trillion, twelve billion, five hundred twenty-one million, one hundred twenty-seven thousand, seven hundred sixty-five".