21211503321 has 8 divisors (see below), whose sum is σ = 29257246080. Its totient is φ = 13653381392.

The previous prime is 21211503289. The next prime is 21211503329. The reversal of 21211503321 is 12330511212.

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

It is a cyclic number.

It is not a de Polignac number, because 21211503321 - 2⁵ = 21211503289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211503329) 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 7 ways as a sum of consecutive naturals, for example, 121905105 + ... + 121905278.

It is an arithmetic number, because the mean of its divisors is an integer number (3657155760).

Almost surely, 2^21211503321 is an apocalyptic number.

It is an amenable number.

21211503321 is a deficient number, since it is larger than the sum of its proper divisors (8045742759).

21211503321 is a wasteful number, since it uses less digits than its factorization.

21211503321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243810415.

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 21211503321 in words is "twenty-one billion, two hundred eleven million, five hundred three thousand, three hundred twenty-one".