121550400251 has 8 divisors (see below), whose sum is σ = 139766982144. Its totient is φ = 103546878120.

The previous prime is 121550400241. The next prime is 121550400259. The reversal of 121550400251 is 152004055121.

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

It is not a de Polignac number, because 121550400251 - 2²² = 121546205947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121550400251.

It is not an unprimeable number, because it can be changed into a prime (121550400259) 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, 53263715 + ... + 53265996.

It is an arithmetic number, because the mean of its divisors is an integer number (17470872768).

Almost surely, 2^121550400251 is an apocalyptic number.

121550400251 is a deficient number, since it is larger than the sum of its proper divisors (18216581893).

121550400251 is a wasteful number, since it uses less digits than its factorization.

121550400251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106529881.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 121550400251 its reverse (152004055121), we get a palindrome (273554455372).

The spelling of 121550400251 in words is "one hundred twenty-one billion, five hundred fifty million, four hundred thousand, two hundred fifty-one".