21603145471031 has 2 divisors, whose sum is σ = 21603145471032. Its totient is φ = 21603145471030.

The previous prime is 21603145471021. The next prime is 21603145471079. The reversal of 21603145471031 is 13017454130612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21603145471031 - 2¹⁰ = 21603145470007 is a prime.

It is a super-2 number, since 2×21603145471031² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21603145471021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801572735515 + 10801572735516.

It is an arithmetic number, because the mean of its divisors is an integer number (10801572735516).

Almost surely, 2^{21603145471031} is an apocalyptic number.

21603145471031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21603145471031 is an equidigital number, since it uses as much as digits as its factorization.

21603145471031 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 38.

The spelling of 21603145471031 in words is "twenty-one trillion, six hundred three billion, one hundred forty-five million, four hundred seventy-one thousand, thirty-one".