21022303213 has 4 divisors (see below), whose sum is σ = 21042934560. Its totient is φ = 21001671868.

The previous prime is 21022303199. The next prime is 21022303217. The reversal of 21022303213 is 31230322012.

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 a de Polignac number, because none of the positive numbers 2^k-21022303213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022303217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10314145 + ... + 10316182.

It is an arithmetic number, because the mean of its divisors is an integer number (5260733640).

Almost surely, 2^21022303213 is an apocalyptic number.

It is an amenable number.

21022303213 is a deficient number, since it is larger than the sum of its proper divisors (20631347).

21022303213 is a wasteful number, since it uses less digits than its factorization.

21022303213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20631346.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21022303213 its reverse (31230322012), we get a palindrome (52252625225).

The spelling of 21022303213 in words is "twenty-one billion, twenty-two million, three hundred three thousand, two hundred thirteen".