21213313303 has 32 divisors (see below), whose sum is σ = 27717451776. Its totient is φ = 15755171328.

The previous prime is 21213313273. The next prime is 21213313313. The reversal of 21213313303 is 30331331212.

It is a de Polignac number, because none of the positive numbers 2^k-21213313303 is a prime.

It is a super-2 number, since 2×21213313303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213313313) 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, 574600 + ... + 610402.

It is an arithmetic number, because the mean of its divisors is an integer number (866170368).

Almost surely, 2^21213313303 is an apocalyptic number.

21213313303 is a deficient number, since it is larger than the sum of its proper divisors (6504138473).

21213313303 is a wasteful number, since it uses less digits than its factorization.

21213313303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36223.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21213313303 its reverse (30331331212), we get a palindrome (51544644515).

The spelling of 21213313303 in words is "twenty-one billion, two hundred thirteen million, three hundred thirteen thousand, three hundred three".