21021201202001 has 48 divisors (see below), whose sum is σ = 28442562134400. Its totient is φ = 15086465372160.

The previous prime is 21021201201983. The next prime is 21021201202033. The reversal of 21021201202001 is 10020210212012.

It is a de Polignac number, because none of the positive numbers 2^k-21021201202001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21021201202201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4043951 + ... + 7641723.

It is an arithmetic number, because the mean of its divisors is an integer number (592553377800).

Almost surely, 2^{21021201202001} is an apocalyptic number.

It is an amenable number.

21021201202001 is a deficient number, since it is larger than the sum of its proper divisors (7421360932399).

21021201202001 is a wasteful number, since it uses less digits than its factorization.

21021201202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598266 (or 3598253 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021201202001 its reverse (10020210212012), we get a palindrome (31041411414013).

The spelling of 21021201202001 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two hundred two thousand, one".