121200102105 has 16 divisors (see below), whose sum is σ = 193926413184. Its totient is φ = 64637971200.

The previous prime is 121200102097. The next prime is 121200102109. The reversal of 121200102105 is 501201002121.

It is not a de Polignac number, because 121200102105 - 2³ = 121200102097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (121200102109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427905 + ... + 652305.

It is an arithmetic number, because the mean of its divisors is an integer number (12120400824).

Almost surely, 2^121200102105 is an apocalyptic number.

121200102105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121200102105 is a deficient number, since it is larger than the sum of its proper divisors (72726311079).

121200102105 is a wasteful number, since it uses less digits than its factorization.

121200102105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260416.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 121200102105 its reverse (501201002121), we get a palindrome (622401104226).

The spelling of 121200102105 in words is "one hundred twenty-one billion, two hundred million, one hundred two thousand, one hundred five".