121551020245 has 8 divisors (see below), whose sum is σ = 145909270584. Its totient is φ = 97208785344.

The previous prime is 121551020231. The next prime is 121551020267. The reversal of 121551020245 is 542020155121.

It can be written as a sum of positive squares in 4 ways, for example, as 11755546929 + 109795473316 = 108423^2 + 331354^2 .

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-121551020245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3987154 + ... + 4017523.

It is an arithmetic number, because the mean of its divisors is an integer number (18238658823).

Almost surely, 2^121551020245 is an apocalyptic number.

It is an amenable number.

121551020245 is a deficient number, since it is larger than the sum of its proper divisors (24358250339).

121551020245 is an equidigital number, since it uses as much as digits as its factorization.

121551020245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8007719.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 121551020245 its reverse (542020155121), we get a palindrome (663571175366).

The spelling of 121551020245 in words is "one hundred twenty-one billion, five hundred fifty-one million, twenty thousand, two hundred forty-five".