121121020002001 has 4 divisors (see below), whose sum is σ = 124075191221604. Its totient is φ = 118166848782400.

The previous prime is 121121020001983. The next prime is 121121020002029. The reversal of 121121020002001 is 100200020121121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14139254448400 + 106981765553601 = 3760220^2 + 10343199^2 .

It is a cyclic number.

It is not a de Polignac number, because 121121020002001 - 2⁹ = 121121020001489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121020002071) 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, 1477085609740 + ... + 1477085609821.

It is an arithmetic number, because the mean of its divisors is an integer number (31018797805401).

Almost surely, 2^{121121020002001} is an apocalyptic number.

It is an amenable number.

121121020002001 is a deficient number, since it is larger than the sum of its proper divisors (2954171219603).

121121020002001 is an equidigital number, since it uses as much as digits as its factorization.

121121020002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954171219602.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121121020002001 its reverse (100200020121121), we get a palindrome (221321040123122).

The spelling of 121121020002001 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty million, two thousand, one".