21000102012001 has 16 divisors (see below), whose sum is σ = 25930498118400. Its totient is φ = 16941258761280.

The previous prime is 21000102011983. The next prime is 21000102012017. The reversal of 21000102012001 is 10021020100012.

It is not a de Polignac number, because 21000102012001 - 2¹⁹ = 21000101487713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000102012061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800723205 + ... + 1800734866.

It is an arithmetic number, because the mean of its divisors is an integer number (1620656132400).

Almost surely, 2^{21000102012001} is an apocalyptic number.

It is an amenable number.

21000102012001 is a deficient number, since it is larger than the sum of its proper divisors (4930396106399).

21000102012001 is an equidigital number, since it uses as much as digits as its factorization.

21000102012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601458109 (or 3601458095 counting only the distinct ones).

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

Adding to 21000102012001 its reverse (10021020100012), we get a palindrome (31021122112013).

The spelling of 21000102012001 in words is "twenty-one trillion, one hundred two million, twelve thousand, one".