21000123002001 has 16 divisors (see below), whose sum is σ = 32895297570240. Its totient is φ = 11748320560320.

The previous prime is 21000123001987. The next prime is 21000123002093. The reversal of 21000123002001 is 10020032100012.

It is not a de Polignac number, because 21000123002001 - 2⁶ = 21000123001937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000123402001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24475667406 + ... + 24475668263.

It is an arithmetic number, because the mean of its divisors is an integer number (2055956098140).

Almost surely, 2^{21000123002001} is an apocalyptic number.

It is an amenable number.

21000123002001 is a deficient number, since it is larger than the sum of its proper divisors (11895174568239).

21000123002001 is a wasteful number, since it uses less digits than its factorization.

21000123002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48951335696.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21000123002001 its reverse (10020032100012), we get a palindrome (31020155102013).

The spelling of 21000123002001 in words is "twenty-one trillion, one hundred twenty-three million, two thousand, one".