21233111201 has 16 divisors (see below), whose sum is σ = 22760306688. Its totient is φ = 19772294400.

The previous prime is 21233111191. The next prime is 21233111203. The reversal of 21233111201 is 10211133212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233111201 is a prime.

It is a super-2 number, since 2×21233111201² (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 21233111201.

It is not an unprimeable number, because it can be changed into a prime (21233111203) 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, 21641 + ... + 207206.

It is an arithmetic number, because the mean of its divisors is an integer number (1422519168).

Almost surely, 2^21233111201 is an apocalyptic number.

It is an amenable number.

21233111201 is a deficient number, since it is larger than the sum of its proper divisors (1527195487).

21233111201 is a wasteful number, since it uses less digits than its factorization.

21233111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228992.

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

Adding to 21233111201 its reverse (10211133212), we get a palindrome (31444244413).

The spelling of 21233111201 in words is "twenty-one billion, two hundred thirty-three million, one hundred eleven thousand, two hundred one".