121121100001 has 4 divisors (see below), whose sum is σ = 132132109104. Its totient is φ = 110110090900.

The previous prime is 121121099987. The next prime is 121121100017. The reversal of 121121100001 is 100001121121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121121100001 - 2⁷ = 121121099873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121700001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505504535 + ... + 5505504556.

It is an arithmetic number, because the mean of its divisors is an integer number (33033027276).

Almost surely, 2^121121100001 is an apocalyptic number.

121121100001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121100001 is a deficient number, since it is larger than the sum of its proper divisors (11011009103).

121121100001 is a wasteful number, since it uses less digits than its factorization.

121121100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011009102.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121121100001 its reverse (100001121121), we get a palindrome (221122221122).

It can be divided in two parts, 121121 and 100001, that multiplied together give a palindrome (12112221121).

The spelling of 121121100001 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, one".