21120445427 has 2 divisors, whose sum is σ = 21120445428. Its totient is φ = 21120445426.

The previous prime is 21120445417. The next prime is 21120445459. The reversal of 21120445427 is 72454402112.

It is an a-pointer prime, because the next prime (21120445459) can be obtained adding 21120445427 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120445427 - 2¹⁸ = 21120183283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120445393 and 21120445402.

It is not a weakly prime, because it can be changed into another prime (21120445417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560222713 + 10560222714.

It is an arithmetic number, because the mean of its divisors is an integer number (10560222714).

Almost surely, 2^21120445427 is an apocalyptic number.

21120445427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120445427 is an equidigital number, since it uses as much as digits as its factorization.

21120445427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 32.

Adding to 21120445427 its reverse (72454402112), we get a palindrome (93574847539).

The spelling of 21120445427 in words is "twenty-one billion, one hundred twenty million, four hundred forty-five thousand, four hundred twenty-seven".