21003333213 has 32 divisors (see below), whose sum is σ = 29879456256. Its totient is φ = 13077762048.

The previous prime is 21003333209. The next prime is 21003333217. The reversal of 21003333213 is 31233330012.

It is an interprime number because it is at equal distance from previous prime (21003333209) and next prime (21003333217).

It is not a de Polignac number, because 21003333213 - 2² = 21003333209 is a prime.

It is a super-2 number, since 2×21003333213² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003333213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003333217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3716556 + ... + 3722202.

It is an arithmetic number, because the mean of its divisors is an integer number (933733008).

Almost surely, 2^21003333213 is an apocalyptic number.

It is an amenable number.

21003333213 is a deficient number, since it is larger than the sum of its proper divisors (8876123043).

21003333213 is a wasteful number, since it uses less digits than its factorization.

21003333213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6213.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21003333213 its reverse (31233330012), we get a palindrome (52236663225).

The spelling of 21003333213 in words is "twenty-one billion, three million, three hundred thirty-three thousand, two hundred thirteen".