121432554521 has 4 divisors (see below), whose sum is σ = 124714515492. Its totient is φ = 118150593552.

The previous prime is 121432554517. The next prime is 121432554527. The reversal of 121432554521 is 125455234121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71139558400 + 50292996121 = 266720^2 + 224261^2 .

It is a cyclic number.

It is not a de Polignac number, because 121432554521 - 2² = 121432554517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121432554527) 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 3 ways as a sum of consecutive naturals, for example, 1640980430 + ... + 1640980503.

It is an arithmetic number, because the mean of its divisors is an integer number (31178628873).

Almost surely, 2^121432554521 is an apocalyptic number.

It is an amenable number.

121432554521 is a deficient number, since it is larger than the sum of its proper divisors (3281960971).

121432554521 is an equidigital number, since it uses as much as digits as its factorization.

121432554521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281960970.

The product of its digits is 48000, while the sum is 35.

Adding to 121432554521 its reverse (125455234121), we get a palindrome (246887788642).

The spelling of 121432554521 in words is "one hundred twenty-one billion, four hundred thirty-two million, five hundred fifty-four thousand, five hundred twenty-one".