2100121021001 has 4 divisors (see below), whose sum is σ = 2100479592852. Its totient is φ = 2099762449152.

The previous prime is 2100121020983. The next prime is 2100121021021. The reversal of 2100121021001 is 1001201210012.

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 841631934025 + 1258489086976 = 917405^2 + 1121824^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100121021001 - 2³⁰ = 2099047279177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100121021021) 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, 179277140 + ... + 179288853.

It is an arithmetic number, because the mean of its divisors is an integer number (525119898213).

Almost surely, 2^{2100121021001} is an apocalyptic number.

It is an amenable number.

2100121021001 is a deficient number, since it is larger than the sum of its proper divisors (358571851).

2100121021001 is an equidigital number, since it uses as much as digits as its factorization.

2100121021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358571850.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2100121021001 its reverse (1001201210012), we get a palindrome (3101322231013).

The spelling of 2100121021001 in words is "two trillion, one hundred billion, one hundred twenty-one million, twenty-one thousand, one".