21211011321 has 8 divisors (see below), whose sum is σ = 28335425760. Its totient is φ = 14113635552.

The previous prime is 21211011293. The next prime is 21211011337. The reversal of 21211011321 is 12311011212.

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

It is not a de Polignac number, because 21211011321 - 2⁷ = 21211011193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211011321.

It is not an unprimeable number, because it can be changed into a prime (21211011391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6757836 + ... + 6760973.

It is an arithmetic number, because the mean of its divisors is an integer number (3541928220).

Almost surely, 2^21211011321 is an apocalyptic number.

It is an amenable number.

21211011321 is a deficient number, since it is larger than the sum of its proper divisors (7124414439).

21211011321 is a wasteful number, since it uses less digits than its factorization.

21211011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13519335.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21211011321 its reverse (12311011212), we get a palindrome (33522022533).

The spelling of 21211011321 in words is "twenty-one billion, two hundred eleven million, eleven thousand, three hundred twenty-one".