21001001121033 has 16 divisors (see below), whose sum is σ = 28008707527680. Its totient is φ = 13996981498896.

The previous prime is 21001001121031. The next prime is 21001001121071. The reversal of 21001001121033 is 33012110010012.

It is a happy number.

It is not a de Polignac number, because 21001001121033 - 2¹ = 21001001121031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001001121031) 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, 236434716 + ... + 236523522.

It is an arithmetic number, because the mean of its divisors is an integer number (1750544220480).

Almost surely, 2^{21001001121033} is an apocalyptic number.

It is an amenable number.

21001001121033 is a deficient number, since it is larger than the sum of its proper divisors (7007706406647).

21001001121033 is a wasteful number, since it uses less digits than its factorization.

21001001121033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108676.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21001001121033 its reverse (33012110010012), we get a palindrome (54013111131045).

The spelling of 21001001121033 in words is "twenty-one trillion, one billion, one million, one hundred twenty-one thousand, thirty-three".