121121221002001 has 4 divisors (see below), whose sum is σ = 132132241093104. Its totient is φ = 110110200910900.

The previous prime is 121121221001993. The next prime is 121121221002029. The reversal of 121121221002001 is 100200122121121.

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 121121221002001 - 2³ = 121121221001993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121221002091) 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, 5505510045535 + ... + 5505510045556.

It is an arithmetic number, because the mean of its divisors is an integer number (33033060273276).

Almost surely, 2^{121121221002001} is an apocalyptic number.

121121221002001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121221002001 is a deficient number, since it is larger than the sum of its proper divisors (11011020091103).

121121221002001 is a wasteful number, since it uses less digits than its factorization.

121121221002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011020091102.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121121221002001 its reverse (100200122121121), we get a palindrome (221321343123122).

The spelling of 121121221002001 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, two thousand, one".