21000000121001 has 8 divisors (see below), whose sum is σ = 23024212104000. Its totient is φ = 18994974981840.

The previous prime is 21000000120943. The next prime is 21000000121007. The reversal of 21000000121001 is 10012100000012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21000000121001 - 2²⁶ = 20999933012137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000000121001.

It is not an unprimeable number, because it can be changed into a prime (21000000121007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4796708666 + ... + 4796713043.

It is an arithmetic number, because the mean of its divisors is an integer number (2878026513000).

Almost surely, 2^{21000000121001} is an apocalyptic number.

It is an amenable number.

21000000121001 is a deficient number, since it is larger than the sum of its proper divisors (2024211982999).

21000000121001 is a wasteful number, since it uses less digits than its factorization.

21000000121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9593421919.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000000121001 its reverse (10012100000012), we get a palindrome (31012100121013).

It can be divided in two parts, 2100000012 and 1001, that multiplied together give a palindrome (2102100012012).

The spelling of 21000000121001 in words is "twenty-one trillion, one hundred twenty-one thousand, one".