121710100215 has 64 divisors (see below), whose sum is σ = 219859660800. Its totient is φ = 56959641600.

The previous prime is 121710100207. The next prime is 121710100217. The reversal of 121710100215 is 512001017121.

It is not a de Polignac number, because 121710100215 - 2³ = 121710100207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121710100191 and 121710100200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121710100217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1959151 + ... + 2020319.

It is an arithmetic number, because the mean of its divisors is an integer number (3435307200).

Almost surely, 2^121710100215 is an apocalyptic number.

121710100215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121710100215 is a deficient number, since it is larger than the sum of its proper divisors (98149560585).

121710100215 is a wasteful number, since it uses less digits than its factorization.

121710100215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61608.

The product of its (nonzero) digits is 140, while the sum is 21.

Adding to 121710100215 its reverse (512001017121), we get a palindrome (633711117336).

The spelling of 121710100215 in words is "one hundred twenty-one billion, seven hundred ten million, one hundred thousand, two hundred fifteen".