21002032213 has 4 divisors (see below), whose sum is σ = 21209973228. Its totient is φ = 20794091200.

The previous prime is 21002032193. The next prime is 21002032243. The reversal of 21002032213 is 31223020012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9852150564 + 11149881649 = 99258^2 + 105593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002032213 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 (21002032243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103970356 + ... + 103970557.

It is an arithmetic number, because the mean of its divisors is an integer number (5302493307).

Almost surely, 2^21002032213 is an apocalyptic number.

It is an amenable number.

21002032213 is a deficient number, since it is larger than the sum of its proper divisors (207941015).

21002032213 is a wasteful number, since it uses less digits than its factorization.

21002032213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207941014.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002032213 its reverse (31223020012), we get a palindrome (52225052225).

The spelling of 21002032213 in words is "twenty-one billion, two million, thirty-two thousand, two hundred thirteen".