21230514221 has 4 divisors (see below), whose sum is σ = 24263444832. Its totient is φ = 18197583612.

The previous prime is 21230514187. The next prime is 21230514229. The reversal of 21230514221 is 12241503212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21230514221 - 2¹⁰ = 21230513197 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 (21230514229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516465295 + ... + 1516465308.

It is an arithmetic number, because the mean of its divisors is an integer number (6065861208).

Almost surely, 2^21230514221 is an apocalyptic number.

It is an amenable number.

21230514221 is a deficient number, since it is larger than the sum of its proper divisors (3032930611).

21230514221 is an equidigital number, since it uses as much as digits as its factorization.

21230514221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032930610.

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 21230514221 in words is "twenty-one billion, two hundred thirty million, five hundred fourteen thousand, two hundred twenty-one".