121100401 has 8 divisors (see below), whose sum is σ = 128544840. Its totient is φ = 113691648.

The previous prime is 121100383. The next prime is 121100407. The reversal of 121100401 is 104001121.

It can be written as a sum of positive squares in 4 ways, for example, as 91680625 + 29419776 = 9575^2 + 5424^2 .

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

It is not a de Polignac number, because 121100401 - 2¹⁵ = 121067633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121100407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1756 + ... + 15661.

It is an arithmetic number, because the mean of its divisors is an integer number (16068105).

Almost surely, 2^121100401 is an apocalyptic number.

It is an amenable number.

121100401 is a deficient number, since it is larger than the sum of its proper divisors (7444439).

121100401 is a wasteful number, since it uses less digits than its factorization.

121100401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17843.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121100401 is about 11004.5627355202. The cubic root of 121100401 is about 494.7455087430.

Adding to 121100401 its reverse (104001121), we get a palindrome (225101522).

The spelling of 121100401 in words is "one hundred twenty-one million, one hundred thousand, four hundred one".