121520244747 has 32 divisors (see below), whose sum is σ = 187820446464. Its totient is φ = 69069593600.

The previous prime is 121520244733. The next prime is 121520244757. The reversal of 121520244747 is 747442025121.

It is a cyclic number.

It is not a de Polignac number, because 121520244747 - 2⁴ = 121520244731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121520244757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227793 + ... + 543074.

It is an arithmetic number, because the mean of its divisors is an integer number (5869388952).

Almost surely, 2^121520244747 is an apocalyptic number.

121520244747 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

121520244747 is a deficient number, since it is larger than the sum of its proper divisors (66300201717).

121520244747 is a wasteful number, since it uses less digits than its factorization.

121520244747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771179.

The product of its (nonzero) digits is 125440, while the sum is 39.

Adding to 121520244747 its reverse (747442025121), we get a palindrome (868962269868).

The spelling of 121520244747 in words is "one hundred twenty-one billion, five hundred twenty million, two hundred forty-four thousand, seven hundred forty-seven".