21021010011321 has 8 divisors (see below), whose sum is σ = 28044186473280. Its totient is φ = 14005920111792.

The previous prime is 21021010011283. The next prime is 21021010011361. The reversal of 21021010011321 is 12311001012012.

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

It is not a de Polignac number, because 21021010011321 - 2⁷ = 21021010011193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21021010011321.

It is not an unprimeable number, because it can be changed into a prime (21021010011361) 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, 2021634541 + ... + 2021644938.

It is an arithmetic number, because the mean of its divisors is an integer number (3505523309160).

Almost surely, 2^{21021010011321} is an apocalyptic number.

It is an amenable number.

21021010011321 is a deficient number, since it is larger than the sum of its proper divisors (7023176461959).

21021010011321 is a wasteful number, since it uses less digits than its factorization.

21021010011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043281215.

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

Adding to 21021010011321 its reverse (12311001012012), we get a palindrome (33332011023333).

The spelling of 21021010011321 in words is "twenty-one trillion, twenty-one billion, ten million, eleven thousand, three hundred twenty-one".