21211323013 has 8 divisors (see below), whose sum is σ = 21313635840. Its totient is φ = 21109152000.

The previous prime is 21211322953. The next prime is 21211323043. The reversal of 21211323013 is 31032311212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211323013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211323043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270748 + ... + 340186.

It is an arithmetic number, because the mean of its divisors is an integer number (2664204480).

Almost surely, 2^21211323013 is an apocalyptic number.

It is an amenable number.

21211323013 is a deficient number, since it is larger than the sum of its proper divisors (102312827).

21211323013 is a wasteful number, since it uses less digits than its factorization.

21211323013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70907.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21211323013 its reverse (31032311212), we get a palindrome (52243634225).

It can be divided in two parts, 212 and 11323013, that added together give a square (11323225 = 3365²).

The spelling of 21211323013 in words is "twenty-one billion, two hundred eleven million, three hundred twenty-three thousand, thirteen".