121971600478 has 32 divisors (see below), whose sum is σ = 225308857536. Its totient is φ = 48224533248.

The previous prime is 121971600451. The next prime is 121971600479. The reversal of 121971600478 is 874006179121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121971600479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122050 + ... + 508762.

It is an arithmetic number, because the mean of its divisors is an integer number (7040901798).

Almost surely, 2^121971600478 is an apocalyptic number.

121971600478 is a deficient number, since it is larger than the sum of its proper divisors (103337257058).

121971600478 is a wasteful number, since it uses less digits than its factorization.

121971600478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388468.

The product of its (nonzero) digits is 169344, while the sum is 46.

Adding to 121971600478 its reverse (874006179121), we get a palindrome (995977779599).

The spelling of 121971600478 in words is "one hundred twenty-one billion, nine hundred seventy-one million, six hundred thousand, four hundred seventy-eight".