21325020427 has 2 divisors, whose sum is σ = 21325020428. Its totient is φ = 21325020426.

The previous prime is 21325020413. The next prime is 21325020449. The reversal of 21325020427 is 72402052312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21325020427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21325020395 and 21325020404.

It is not a weakly prime, because it can be changed into another prime (21325020467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662510213 + 10662510214.

It is an arithmetic number, because the mean of its divisors is an integer number (10662510214).

Almost surely, 2^21325020427 is an apocalyptic number.

21325020427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325020427 is an equidigital number, since it uses as much as digits as its factorization.

21325020427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

Adding to 21325020427 its reverse (72402052312), we get a palindrome (93727072739).

The spelling of 21325020427 in words is "twenty-one billion, three hundred twenty-five million, twenty thousand, four hundred twenty-seven".