21201023233 has 16 divisors (see below), whose sum is σ = 23010164800. Its totient is φ = 19417527360.

The previous prime is 21201023203. The next prime is 21201023267. The reversal of 21201023233 is 33232010212.

It is a cyclic number.

It is not a de Polignac number, because 21201023233 - 2²⁹ = 20664152321 is a prime.

It is a super-2 number, since 2×21201023233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201023233.

It is not an unprimeable number, because it can be changed into a prime (21201023203) 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, 4585663 + ... + 4590283.

It is an arithmetic number, because the mean of its divisors is an integer number (1438135300).

Almost surely, 2^21201023233 is an apocalyptic number.

It is an amenable number.

21201023233 is a deficient number, since it is larger than the sum of its proper divisors (1809141567).

21201023233 is a wasteful number, since it uses less digits than its factorization.

21201023233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7312.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21201023233 its reverse (33232010212), we get a palindrome (54433033445).

The spelling of 21201023233 in words is "twenty-one billion, two hundred one million, twenty-three thousand, two hundred thirty-three".