21130145321 has 8 divisors (see below), whose sum is σ = 21874272000. Its totient is φ = 20389925520.

The previous prime is 21130145317. The next prime is 21130145371. The reversal of 21130145321 is 12354103112.

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 21130145321 - 2² = 21130145317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130145371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965711 + ... + 987348.

It is an arithmetic number, because the mean of its divisors is an integer number (2734284000).

Almost surely, 2^21130145321 is an apocalyptic number.

It is an amenable number.

21130145321 is a deficient number, since it is larger than the sum of its proper divisors (744126679).

21130145321 is a wasteful number, since it uses less digits than its factorization.

21130145321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953439.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21130145321 its reverse (12354103112), we get a palindrome (33484248433).

The spelling of 21130145321 in words is "twenty-one billion, one hundred thirty million, one hundred forty-five thousand, three hundred twenty-one".