21076399321 has 8 divisors (see below), whose sum is σ = 21346101000. Its totient is φ = 20807894400.

The previous prime is 21076399297. The next prime is 21076399343. The reversal of 21076399321 is 12399367012.

It can be written as a sum of positive squares in 4 ways, for example, as 17933227225 + 3143172096 = 133915^2 + 56064^2 .

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 21076399321 - 2¹⁷ = 21076268249 is a prime.

It is a super-3 number, since 3×21076399321³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21076399391) 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, 263716 + ... + 334213.

It is an arithmetic number, because the mean of its divisors is an integer number (2668262625).

Almost surely, 2^21076399321 is an apocalyptic number.

It is an amenable number.

21076399321 is a deficient number, since it is larger than the sum of its proper divisors (269701679).

21076399321 is a wasteful number, since it uses less digits than its factorization.

21076399321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598379.

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 21076399321 in words is "twenty-one billion, seventy-six million, three hundred ninety-nine thousand, three hundred twenty-one".