121254120520 has 64 divisors (see below), whose sum is σ = 293849519040. Its totient is φ = 44764435200.

The previous prime is 121254120517. The next prime is 121254120551. The reversal of 121254120520 is 25021452121.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5360835 + ... + 5383405.

It is an arithmetic number, because the mean of its divisors is an integer number (4591398735).

Almost surely, 2^121254120520 is an apocalyptic number.

121254120520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121254120520 is an abundant number, since it is smaller than the sum of its proper divisors (172595398520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121254120520 is a wasteful number, since it uses less digits than its factorization.

121254120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32926 (or 32922 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 121254120520 its reverse (25021452121), we get a palindrome (146275572641).

The spelling of 121254120520 in words is "one hundred twenty-one billion, two hundred fifty-four million, one hundred twenty thousand, five hundred twenty".