20126324571261 has 4 divisors (see below), whose sum is σ = 26835099428352. Its totient is φ = 13417549714172.

The previous prime is 20126324571259. The next prime is 20126324571313. The reversal of 20126324571261 is 16217542362102.

It is a happy number.

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 not a de Polignac number, because 20126324571261 - 2¹ = 20126324571259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126324571251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3354387428541 + ... + 3354387428546.

It is an arithmetic number, because the mean of its divisors is an integer number (6708774857088).

Almost surely, 2^{20126324571261} is an apocalyptic number.

It is an amenable number.

20126324571261 is a deficient number, since it is larger than the sum of its proper divisors (6708774857091).

20126324571261 is an equidigital number, since it uses as much as digits as its factorization.

20126324571261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6708774857090.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 20126324571261 in words is "twenty trillion, one hundred twenty-six billion, three hundred twenty-four million, five hundred seventy-one thousand, two hundred sixty-one".