21021213012233 has 4 divisors (see below), whose sum is σ = 24024243442560. Its totient is φ = 18018182581908.

The previous prime is 21021213012193. The next prime is 21021213012253. The reversal of 21021213012233 is 33221031212012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21021213012233 - 2⁶ = 21021213012169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021213012199 and 21021213012208.

It is not an unprimeable number, because it can be changed into a prime (21021213012253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501515215153 + ... + 1501515215166.

It is an arithmetic number, because the mean of its divisors is an integer number (6006060860640).

Almost surely, 2^{21021213012233} is an apocalyptic number.

It is an amenable number.

21021213012233 is a deficient number, since it is larger than the sum of its proper divisors (3003030430327).

21021213012233 is an equidigital number, since it uses as much as digits as its factorization.

21021213012233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003030430326.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21021213012233 its reverse (33221031212012), we get a palindrome (54242244224245).

The spelling of 21021213012233 in words is "twenty-one trillion, twenty-one billion, two hundred thirteen million, twelve thousand, two hundred thirty-three".