21012300233 has 8 divisors (see below), whose sum is σ = 22681944000. Its totient is φ = 19405661968.

The previous prime is 21012300181. The next prime is 21012300251. The reversal of 21012300233 is 33200321012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012300233 - 2²⁶ = 20945191369 is a prime.

It is a super-2 number, since 2×21012300233² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21012300263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15750683 + ... + 15752016.

It is an arithmetic number, because the mean of its divisors is an integer number (2835243000).

Almost surely, 2^21012300233 is an apocalyptic number.

21012300233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21012300233 is a deficient number, since it is larger than the sum of its proper divisors (1669643767).

21012300233 is a wasteful number, since it uses less digits than its factorization.

21012300233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31502751.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21012300233 its reverse (33200321012), we get a palindrome (54212621245).

The spelling of 21012300233 in words is "twenty-one billion, twelve million, three hundred thousand, two hundred thirty-three".