21213032313 has 16 divisors (see below), whose sum is σ = 31289905152. Its totient is φ = 12675306000.

The previous prime is 21213032287. The next prime is 21213032359. The reversal of 21213032313 is 31323031212.

It is a de Polignac number, because none of the positive numbers 2^k-21213032313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213032313.

It is not an unprimeable number, because it can be changed into a prime (21213032713) 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 15 ways as a sum of consecutive naturals, for example, 4524553 + ... + 4529238.

It is an arithmetic number, because the mean of its divisors is an integer number (1955619072).

Almost surely, 2^21213032313 is an apocalyptic number.

It is an amenable number.

21213032313 is a deficient number, since it is larger than the sum of its proper divisors (10076872839).

21213032313 is a wasteful number, since it uses less digits than its factorization.

21213032313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9053876.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21213032313 its reverse (31323031212), we get a palindrome (52536063525).

The spelling of 21213032313 in words is "twenty-one billion, two hundred thirteen million, thirty-two thousand, three hundred thirteen".