129256220419 has 4 divisors (see below), whose sum is σ = 129261920040. Its totient is φ = 129250520800.

The previous prime is 129256220417. The next prime is 129256220441. The reversal of 129256220419 is 914022652921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129256220419 - 2¹ = 129256220417 is a prime.

It is a super-2 number, since 2×129256220419² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129256220417) 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, 2815657 + ... + 2861194.

It is an arithmetic number, because the mean of its divisors is an integer number (32315480010).

Almost surely, 2^129256220419 is an apocalyptic number.

129256220419 is a deficient number, since it is larger than the sum of its proper divisors (5699621).

129256220419 is an equidigital number, since it uses as much as digits as its factorization.

129256220419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699620.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 129256220419 in words is "one hundred twenty-nine billion, two hundred fifty-six million, two hundred twenty thousand, four hundred nineteen".