21130323223021 has 8 divisors (see below), whose sum is σ = 21476806443288. Its totient is φ = 20783842728000.

The previous prime is 21130323223003. The next prime is 21130323223057. The reversal of 21130323223021 is 12032232303112.

It can be written as a sum of positive squares in 4 ways, for example, as 3146667993225 + 17983655229796 = 1773885^2 + 4240714^2 .

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 21130323223021 - 2⁵ = 21130323222989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130329223021) 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, 20114391 + ... + 21138811.

It is an arithmetic number, because the mean of its divisors is an integer number (2684600805411).

Almost surely, 2^{21130323223021} is an apocalyptic number.

It is an amenable number.

21130323223021 is a deficient number, since it is larger than the sum of its proper divisors (346483220267).

21130323223021 is a wasteful number, since it uses less digits than its factorization.

21130323223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362623.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21130323223021 its reverse (12032232303112), we get a palindrome (33162555526133).

The spelling of 21130323223021 in words is "twenty-one trillion, one hundred thirty billion, three hundred twenty-three million, two hundred twenty-three thousand, twenty-one".