121551117015 has 8 divisors (see below), whose sum is σ = 194481787248. Its totient is φ = 64827262400.

The previous prime is 121551117011. The next prime is 121551117089. The reversal of 121551117015 is 510711155121.

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

It is not a de Polignac number, because 121551117015 - 2² = 121551117011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121551117011) 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 7 ways as a sum of consecutive naturals, for example, 4051703886 + ... + 4051703915.

It is an arithmetic number, because the mean of its divisors is an integer number (24310223406).

Almost surely, 2^121551117015 is an apocalyptic number.

121551117015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121551117015 is a deficient number, since it is larger than the sum of its proper divisors (72930670233).

121551117015 is an equidigital number, since it uses as much as digits as its factorization.

121551117015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8103407809.

The product of its (nonzero) digits is 1750, while the sum is 30.

The spelling of 121551117015 in words is "one hundred twenty-one billion, five hundred fifty-one million, one hundred seventeen thousand, fifteen".