121200101 has 24 divisors (see below), whose sum is σ = 139021920. Its totient is φ = 104748000.

The previous prime is 121200097. The next prime is 121200109. The reversal of 121200101 is 101002121.

It is not a de Polignac number, because 121200101 - 2² = 121200097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1199951 + ... + 1200051.

It is an arithmetic number, because the mean of its divisors is an integer number (5792580).

Almost surely, 2^121200101 is an apocalyptic number.

121200101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121200101 is a deficient number, since it is larger than the sum of its proper divisors (17821819).

121200101 is a wasteful number, since it uses less digits than its factorization.

121200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 121200101 is about 11009.0917427370. The cubic root of 121200101 is about 494.8812434902.

Adding to 121200101 its reverse (101002121), we get a palindrome (222202222).

The spelling of 121200101 in words is "one hundred twenty-one million, two hundred thousand, one hundred one".