121506231251 has 8 divisors (see below), whose sum is σ = 122984946000. Its totient is φ = 120027868672.

The previous prime is 121506231227. The next prime is 121506231299. The reversal of 121506231251 is 152132605121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121506231251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121506231211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642875 + ... + 810123.

It is an arithmetic number, because the mean of its divisors is an integer number (15373118250).

Almost surely, 2^121506231251 is an apocalyptic number.

121506231251 is a deficient number, since it is larger than the sum of its proper divisors (1478714749).

121506231251 is an equidigital number, since it uses as much as digits as its factorization.

121506231251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176085.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 121506231251 its reverse (152132605121), we get a palindrome (273638836372).

The spelling of 121506231251 in words is "one hundred twenty-one billion, five hundred six million, two hundred thirty-one thousand, two hundred fifty-one".