21000335240001 has 32 divisors (see below), whose sum is σ = 30696853777408. Its totient is φ = 12691937459520.

The previous prime is 21000335239993. The next prime is 21000335240039. The reversal of 21000335240001 is 10004253300012.

It is not a de Polignac number, because 21000335240001 - 2³ = 21000335239993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000335240001.

It is not an unprimeable number, because it can be changed into a prime (21000335240041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11275381 + ... + 13005186.

It is an arithmetic number, because the mean of its divisors is an integer number (959276680544).

Almost surely, 2^{21000335240001} is an apocalyptic number.

It is an amenable number.

21000335240001 is a deficient number, since it is larger than the sum of its proper divisors (9696518537407).

21000335240001 is a wasteful number, since it uses less digits than its factorization.

21000335240001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24280981.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21000335240001 its reverse (10004253300012), we get a palindrome (31004588540013).

The spelling of 21000335240001 in words is "twenty-one trillion, three hundred thirty-five million, two hundred forty thousand, one".