21403202273 has 2 divisors, whose sum is σ = 21403202274. Its totient is φ = 21403202272.

The previous prime is 21403202267. The next prime is 21403202321. The reversal of 21403202273 is 37220230412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16676364769 + 4726837504 = 129137^2 + 68752^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403202273 - 2⁶ = 21403202209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21403205273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701601136 + 10701601137.

It is an arithmetic number, because the mean of its divisors is an integer number (10701601137).

Almost surely, 2^21403202273 is an apocalyptic number.

It is an amenable number.

21403202273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403202273 is an equidigital number, since it uses as much as digits as its factorization.

21403202273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

Adding to 21403202273 its reverse (37220230412), we get a palindrome (58623432685).

The spelling of 21403202273 in words is "twenty-one billion, four hundred three million, two hundred two thousand, two hundred seventy-three".