121528134450 has 72 divisors (see below), whose sum is σ = 326634736896. Its totient is φ = 32394684000.

The previous prime is 121528134407. The next prime is 121528134463. The reversal of 121528134450 is 54431825121.

121528134450 is a `hidden beast` number, since 1 + 21 + 52 + 8 + 134 + 450 = 666.

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 35 ways as a sum of consecutive naturals, for example, 1113835 + ... + 1218065.

It is an arithmetic number, because the mean of its divisors is an integer number (4536593568).

Almost surely, 2^121528134450 is an apocalyptic number.

121528134450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121528134450 is an abundant number, since it is smaller than the sum of its proper divisors (205106602446).

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

121528134450 is a wasteful number, since it uses less digits than its factorization.

121528134450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106840 (or 106832 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

Adding to 121528134450 its reverse (54431825121), we get a palindrome (175959959571).

The spelling of 121528134450 in words is "one hundred twenty-one billion, five hundred twenty-eight million, one hundred thirty-four thousand, four hundred fifty".