121720127126 has 32 divisors (see below), whose sum is σ = 210101078880. Its totient is φ = 52388798976.

The previous prime is 121720127119. The next prime is 121720127129. The reversal of 121720127126 is 621721027121.

It is a junction number, because it is equal to n+sod(n) for n = 121720127092 and 121720127101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121720127129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1215056 + ... + 1311411.

It is an arithmetic number, because the mean of its divisors is an integer number (6565658715).

Almost surely, 2^121720127126 is an apocalyptic number.

121720127126 is a deficient number, since it is larger than the sum of its proper divisors (88380951754).

121720127126 is a wasteful number, since it uses less digits than its factorization.

121720127126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526608.

The product of its (nonzero) digits is 4704, while the sum is 32.

The spelling of 121720127126 in words is "one hundred twenty-one billion, seven hundred twenty million, one hundred twenty-seven thousand, one hundred twenty-six".