121100001 has 16 divisors (see below), whose sum is σ = 180907968. Its totient is φ = 71409600.

The previous prime is 121099999. The next prime is 121100003. The reversal of 121100001 is 100001121.

It is an interprime number because it is at equal distance from previous prime (121099999) and next prime (121100003).

It is not a de Polignac number, because 121100001 - 2¹ = 121099999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121100003) 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 15 ways as a sum of consecutive naturals, for example, 48370 + ... + 50811.

It is an arithmetic number, because the mean of its divisors is an integer number (11306748).

Almost surely, 2^121100001 is an apocalyptic number.

121100001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121100001 is a deficient number, since it is larger than the sum of its proper divisors (59807967).

121100001 is a wasteful number, since it uses less digits than its factorization.

121100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99232.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 121100001 is about 11004.5445612256. The cubic root of 121100001 is about 494.7449640203.

Adding to 121100001 its reverse (100001121), we get a palindrome (221101122).

It can be divided in two parts, 121 and 100001, that multiplied together give a palindrome (12100121).

The spelling of 121100001 in words is "one hundred twenty-one million, one hundred thousand, one".