21030121201321 has 8 divisors (see below), whose sum is σ = 21901306509000. Its totient is φ = 20168669808000.

The previous prime is 21030121201319. The next prime is 21030121201337. The reversal of 21030121201321 is 12310212103012.

It can be written as a sum of positive squares in 4 ways, for example, as 2464708463721 + 18565412737600 = 1569939^2 + 4308760^2 .

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 21030121201321 - 2¹ = 21030121201319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030121201351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2433474180 + ... + 2433482821.

It is an arithmetic number, because the mean of its divisors is an integer number (2737663313625).

Almost surely, 2^{21030121201321} is an apocalyptic number.

It is an amenable number.

21030121201321 is a deficient number, since it is larger than the sum of its proper divisors (871185307679).

21030121201321 is a wasteful number, since it uses less digits than its factorization.

21030121201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4866957179.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21030121201321 its reverse (12310212103012), we get a palindrome (33340333304333).

The spelling of 21030121201321 in words is "twenty-one trillion, thirty billion, one hundred twenty-one million, two hundred one thousand, three hundred twenty-one".