21001121203233 has 16 divisors (see below), whose sum is σ = 28098226941120. Its totient is φ = 13952385426624.

The previous prime is 21001121203213. The next prime is 21001121203253. The reversal of 21001121203233 is 33230212110012.

It is an interprime number because it is at equal distance from previous prime (21001121203213) and next prime (21001121203253).

It is not a de Polignac number, because 21001121203233 - 2¹⁶ = 21001121137697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001121203213) 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 15 ways as a sum of consecutive naturals, for example, 21284263 + ... + 22249091.

It is an arithmetic number, because the mean of its divisors is an integer number (1756139183820).

Almost surely, 2^{21001121203233} is an apocalyptic number.

It is an amenable number.

21001121203233 is a deficient number, since it is larger than the sum of its proper divisors (7097105737887).

21001121203233 is a wasteful number, since it uses less digits than its factorization.

21001121203233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989888.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21001121203233 its reverse (33230212110012), we get a palindrome (54231333313245).

The spelling of 21001121203233 in words is "twenty-one trillion, one billion, one hundred twenty-one million, two hundred three thousand, two hundred thirty-three".