21000002001001 has 8 divisors (see below), whose sum is σ = 22328330952960. Its totient is φ = 19682010239808.

The previous prime is 21000002000977. The next prime is 21000002001023. The reversal of 21000002001001 is 10010020000012.

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

It is not a de Polignac number, because 21000002001001 - 2⁵ = 21000002000969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000002001031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2584293501 + ... + 2584301626.

It is an arithmetic number, because the mean of its divisors is an integer number (2791041369120).

Almost surely, 2^{21000002001001} is an apocalyptic number.

It is an amenable number.

21000002001001 is a deficient number, since it is larger than the sum of its proper divisors (1328328951959).

21000002001001 is a wasteful number, since it uses less digits than its factorization.

21000002001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5168595383.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000002001001 its reverse (10010020000012), we get a palindrome (31010022001013).

The spelling of 21000002001001 in words is "twenty-one trillion, two million, one thousand, one".