126221530879 has 4 divisors (see below), whose sum is σ = 128360878920. Its totient is φ = 124082182840.

The previous prime is 126221530871. The next prime is 126221530913. The reversal of 126221530879 is 978035122621.

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 126221530879 - 2³ = 126221530871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126221530871) 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, 1069673932 + ... + 1069674049.

It is an arithmetic number, because the mean of its divisors is an integer number (32090219730).

Almost surely, 2^126221530879 is an apocalyptic number.

126221530879 is a deficient number, since it is larger than the sum of its proper divisors (2139348041).

126221530879 is an equidigital number, since it uses as much as digits as its factorization.

126221530879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139348040.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 126221530879 in words is "one hundred twenty-six billion, two hundred twenty-one million, five hundred thirty thousand, eight hundred seventy-nine".