21021331310001 has 24 divisors (see below), whose sum is σ = 33292666877184. Its totient is φ = 12675529712160.

The previous prime is 21021331309967. The next prime is 21021331310027. The reversal of 21021331310001 is 10001313312012.

21021331310001 is a `hidden beast` number, since 2 + 1 + 0 + 21 + 331 + 310 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 21021331310001 - 2²⁹ = 21020794439089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021331310051) 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 23 ways as a sum of consecutive naturals, for example, 538906081 + ... + 538945086.

It is an arithmetic number, because the mean of its divisors is an integer number (1387194453216).

Almost surely, 2^{21021331310001} is an apocalyptic number.

It is an amenable number.

21021331310001 is a deficient number, since it is larger than the sum of its proper divisors (12271335567183).

21021331310001 is a wasteful number, since it uses less digits than its factorization.

21021331310001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077851381 (or 1077851378 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21021331310001 its reverse (10001313312012), we get a palindrome (31022644622013).

The spelling of 21021331310001 in words is "twenty-one trillion, twenty-one billion, three hundred thirty-one million, three hundred ten thousand, one".