21403432573 has 2 divisors, whose sum is σ = 21403432574. Its totient is φ = 21403432572.

The previous prime is 21403432553. The next prime is 21403432597. The reversal of 21403432573 is 37523430412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19570051449 + 1833381124 = 139893^2 + 42818^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403432573 - 2⁵ = 21403432541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21403432553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701716286 + 10701716287.

It is an arithmetic number, because the mean of its divisors is an integer number (10701716287).

Almost surely, 2^21403432573 is an apocalyptic number.

It is an amenable number.

21403432573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403432573 is an equidigital number, since it uses as much as digits as its factorization.

21403432573 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 34.

Adding to 21403432573 its reverse (37523430412), we get a palindrome (58926862985).

The spelling of 21403432573 in words is "twenty-one billion, four hundred three million, four hundred thirty-two thousand, five hundred seventy-three".