2129012328257 has 4 divisors (see below), whose sum is σ = 2129637225216. Its totient is φ = 2128387431300.

The previous prime is 2129012328241. The next prime is 2129012328259. The reversal of 2129012328257 is 7528232109212.

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 2129012328257 - 2⁴ = 2129012328241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129012328259) 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, 312443369 + ... + 312450182.

It is an arithmetic number, because the mean of its divisors is an integer number (532409306304).

Almost surely, 2^{2129012328257} is an apocalyptic number.

It is an amenable number.

2129012328257 is a deficient number, since it is larger than the sum of its proper divisors (624896959).

2129012328257 is an equidigital number, since it uses as much as digits as its factorization.

2129012328257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624896958.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 2129012328257 in words is "two trillion, one hundred twenty-nine billion, twelve million, three hundred twenty-eight thousand, two hundred fifty-seven".