21001113232001 has 16 divisors (see below), whose sum is σ = 24050004781824. Its totient is φ = 17964407841984.

The previous prime is 21001113231971. The next prime is 21001113232009. The reversal of 21001113232001 is 10023231110012.

It is a cyclic number.

It is not a de Polignac number, because 21001113232001 - 2¹⁴ = 21001113215617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001113232009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92971871 + ... + 93197483.

It is an arithmetic number, because the mean of its divisors is an integer number (1503125298864).

Almost surely, 2^{21001113232001} is an apocalyptic number.

It is an amenable number.

21001113232001 is a deficient number, since it is larger than the sum of its proper divisors (3048891549823).

21001113232001 is a wasteful number, since it uses less digits than its factorization.

21001113232001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252560.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21001113232001 its reverse (10023231110012), we get a palindrome (31024344342013).

The spelling of 21001113232001 in words is "twenty-one trillion, one billion, one hundred thirteen million, two hundred thirty-two thousand, one".