21210310233 has 12 divisors (see below), whose sum is σ = 35013845568. Its totient is φ = 12120177240.

The previous prime is 21210310229. The next prime is 21210310237. The reversal of 21210310233 is 33201301212.

21210310233 is a `hidden beast` number, since 2 + 121 + 0 + 310 + 233 = 666.

It is an interprime number because it is at equal distance from previous prime (21210310229) and next prime (21210310237).

It is not a de Polignac number, because 21210310233 - 2² = 21210310229 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210310237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168335733 + ... + 168335858.

It is an arithmetic number, because the mean of its divisors is an integer number (2917820464).

Almost surely, 2^21210310233 is an apocalyptic number.

It is an amenable number.

21210310233 is a deficient number, since it is larger than the sum of its proper divisors (13803535335).

21210310233 is a wasteful number, since it uses less digits than its factorization.

21210310233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336671604 (or 336671601 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21210310233 its reverse (33201301212), we get a palindrome (54411611445).

The spelling of 21210310233 in words is "twenty-one billion, two hundred ten million, three hundred ten thousand, two hundred thirty-three".