21033023213 has 4 divisors (see below), whose sum is σ = 21036355968. Its totient is φ = 21029690460.

The previous prime is 21033023183. The next prime is 21033023239. The reversal of 21033023213 is 31232033012.

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 21033023213 - 2¹⁰ = 21033022189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033023243) 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, 1656893 + ... + 1669538.

It is an arithmetic number, because the mean of its divisors is an integer number (5259088992).

Almost surely, 2^21033023213 is an apocalyptic number.

It is an amenable number.

21033023213 is a deficient number, since it is larger than the sum of its proper divisors (3332755).

21033023213 is an equidigital number, since it uses as much as digits as its factorization.

21033023213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332754.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21033023213 its reverse (31232033012), we get a palindrome (52265056225).

The spelling of 21033023213 in words is "twenty-one billion, thirty-three million, twenty-three thousand, two hundred thirteen".