21210130927 has 2 divisors, whose sum is σ = 21210130928. Its totient is φ = 21210130926.

The previous prime is 21210130891. The next prime is 21210131051. The reversal of 21210130927 is 72903101212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210130927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210130895 and 21210130904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210130727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605065463 + 10605065464.

It is an arithmetic number, because the mean of its divisors is an integer number (10605065464).

Almost surely, 2^21210130927 is an apocalyptic number.

21210130927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210130927 is an equidigital number, since it uses as much as digits as its factorization.

21210130927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The spelling of 21210130927 in words is "twenty-one billion, two hundred ten million, one hundred thirty thousand, nine hundred twenty-seven".