21123000222321 has 16 divisors (see below), whose sum is σ = 28172748447360. Its totient is φ = 14077626710400.

The previous prime is 21123000222281. The next prime is 21123000222349. The reversal of 21123000222321 is 12322200032112.

It is not a de Polignac number, because 21123000222321 - 2¹⁵ = 21123000189553 is a prime.

It is a super-2 number, since 2×21123000222321² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21123000222521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145977235 + ... + 146121863.

It is an arithmetic number, because the mean of its divisors is an integer number (1760796777960).

Almost surely, 2^{21123000222321} is an apocalyptic number.

It is an amenable number.

21123000222321 is a deficient number, since it is larger than the sum of its proper divisors (7049748225039).

21123000222321 is a wasteful number, since it uses less digits than its factorization.

21123000222321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159416.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21123000222321 its reverse (12322200032112), we get a palindrome (33445200254433).

The spelling of 21123000222321 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-two thousand, three hundred twenty-one".