121000021002001 has 4 divisors (see below), whose sum is σ = 121004241618100. Its totient is φ = 120995800385904.

The previous prime is 121000021001989. The next prime is 121000021002031. The reversal of 121000021002001 is 100200120000121.

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 105221640217600 + 15778380784401 = 10257760^2 + 3972201^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000021002001 - 2¹⁷ = 121000020870929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121000021002031) 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, 2110265046 + ... + 2110322383.

It is an arithmetic number, because the mean of its divisors is an integer number (30251060404525).

Almost surely, 2^{121000021002001} is an apocalyptic number.

It is an amenable number.

121000021002001 is a deficient number, since it is larger than the sum of its proper divisors (4220616099).

121000021002001 is an equidigital number, since it uses as much as digits as its factorization.

121000021002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220616098.

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

Adding to 121000021002001 its reverse (100200120000121), we get a palindrome (221200141002122).

The spelling of 121000021002001 in words is "one hundred twenty-one trillion, twenty-one million, two thousand, one".