121542044025 has 48 divisors (see below), whose sum is σ = 207120993408. Its totient is φ = 62861568000.

The previous prime is 121542044023. The next prime is 121542044081. The reversal of 121542044025 is 520440245121.

It is not a de Polignac number, because 121542044025 - 2¹ = 121542044023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121542043983 and 121542044001.

It is not an unprimeable number, because it can be changed into a prime (121542044021) 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 47 ways as a sum of consecutive naturals, for example, 137737 + ... + 511913.

It is an arithmetic number, because the mean of its divisors is an integer number (4315020696).

Almost surely, 2^121542044025 is an apocalyptic number.

121542044025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121542044025 is a deficient number, since it is larger than the sum of its proper divisors (85578949383).

121542044025 is a wasteful number, since it uses less digits than its factorization.

121542044025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374322 (or 374317 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 121542044025 its reverse (520440245121), we get a palindrome (641982289146).

The spelling of 121542044025 in words is "one hundred twenty-one billion, five hundred forty-two million, forty-four thousand, twenty-five".