21603523427 has 2 divisors, whose sum is σ = 21603523428. Its totient is φ = 21603523426.

The previous prime is 21603523411. The next prime is 21603523441. The reversal of 21603523427 is 72432530612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21603523427 - 2⁴ = 21603523411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21603523477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801761713 + 10801761714.

It is an arithmetic number, because the mean of its divisors is an integer number (10801761714).

Almost surely, 2^21603523427 is an apocalyptic number.

21603523427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21603523427 is an equidigital number, since it uses as much as digits as its factorization.

21603523427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 35.

The spelling of 21603523427 in words is "twenty-one billion, six hundred three million, five hundred twenty-three thousand, four hundred twenty-seven".