21001201002001 has 8 divisors (see below), whose sum is σ = 22938306585408. Its totient is φ = 19068746334000.

The previous prime is 21001201001999. The next prime is 21001201002017. The reversal of 21001201002001 is 10020010210012.

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

It is not a de Polignac number, because 21001201002001 - 2¹ = 21001201001999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21007201002001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1162719405 + ... + 1162737466.

It is an arithmetic number, because the mean of its divisors is an integer number (2867288323176).

Almost surely, 2^{21001201002001} is an apocalyptic number.

It is an amenable number.

21001201002001 is a deficient number, since it is larger than the sum of its proper divisors (1937105583407).

21001201002001 is a wasteful number, since it uses less digits than its factorization.

21001201002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325457703.

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

Adding to 21001201002001 its reverse (10020010210012), we get a palindrome (31021211212013).

The spelling of 21001201002001 in words is "twenty-one trillion, one billion, two hundred one million, two thousand, one".