21203403213 has 8 divisors (see below), whose sum is σ = 28352212000. Its totient is φ = 14095098288.

The previous prime is 21203403209. The next prime is 21203403217. The reversal of 21203403213 is 31230430212.

It is an interprime number because it is at equal distance from previous prime (21203403209) and next prime (21203403217).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21203403213 - 2² = 21203403209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21203403213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203403217) 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 7 ways as a sum of consecutive naturals, for example, 10124743 + ... + 10126836.

It is an arithmetic number, because the mean of its divisors is an integer number (3544026500).

Almost surely, 2^21203403213 is an apocalyptic number.

It is an amenable number.

21203403213 is a deficient number, since it is larger than the sum of its proper divisors (7148808787).

21203403213 is a wasteful number, since it uses less digits than its factorization.

21203403213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20251931.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21203403213 its reverse (31230430212), we get a palindrome (52433833425).

The spelling of 21203403213 in words is "twenty-one billion, two hundred three million, four hundred three thousand, two hundred thirteen".