21654013427 has 2 divisors, whose sum is σ = 21654013428. Its totient is φ = 21654013426.

The previous prime is 21654013411. The next prime is 21654013489. The reversal of 21654013427 is 72431045612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21654013427 - 2⁴ = 21654013411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21654013027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827006713 + 10827006714.

It is an arithmetic number, because the mean of its divisors is an integer number (10827006714).

Almost surely, 2^21654013427 is an apocalyptic number.

21654013427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21654013427 is an equidigital number, since it uses as much as digits as its factorization.

21654013427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21654013427 in words is "twenty-one billion, six hundred fifty-four million, thirteen thousand, four hundred twenty-seven".