21130251321 has 8 divisors (see below), whose sum is σ = 28180462464. Its totient is φ = 14083437200.

The previous prime is 21130251287. The next prime is 21130251379. The reversal of 21130251321 is 12315203112.

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 21130251321 - 2⁶ = 21130251257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21130251391) 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, 834705 + ... + 859646.

It is an arithmetic number, because the mean of its divisors is an integer number (3522557808).

Almost surely, 2^21130251321 is an apocalyptic number.

It is an amenable number.

21130251321 is a deficient number, since it is larger than the sum of its proper divisors (7050211143).

21130251321 is a wasteful number, since it uses less digits than its factorization.

21130251321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698511.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21130251321 its reverse (12315203112), we get a palindrome (33445454433).

The spelling of 21130251321 in words is "twenty-one billion, one hundred thirty million, two hundred fifty-one thousand, three hundred twenty-one".