21213033303 has 144 divisors (see below), whose sum is σ = 39177440640. Its totient is φ = 10067500800.

The previous prime is 21213033301. The next prime is 21213033323. The reversal of 21213033303 is 30333031212.

It is not a de Polignac number, because 21213033303 - 2¹ = 21213033301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21213033303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213033301) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 25837633 + ... + 25838453.

It is an arithmetic number, because the mean of its divisors is an integer number (272065560).

Almost surely, 2^21213033303 is an apocalyptic number.

21213033303 is a deficient number, since it is larger than the sum of its proper divisors (17964407337).

21213033303 is a wasteful number, since it uses less digits than its factorization.

21213033303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 890 counting only the distinct ones).

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

Adding to 21213033303 its reverse (30333031212), we get a palindrome (51546064515).

The spelling of 21213033303 in words is "twenty-one billion, two hundred thirteen million, thirty-three thousand, three hundred three".