21730400899219 has 2 divisors, whose sum is σ = 21730400899220. Its totient is φ = 21730400899218.

The previous prime is 21730400899199. The next prime is 21730400899237. The reversal of 21730400899219 is 91299800403712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21730400899219 - 2¹³ = 21730400891027 is a prime.

It is a super-2 number, since 2×21730400899219² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21730400899219.

It is not a weakly prime, because it can be changed into another prime (21730400899279) 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, 10865200449609 + 10865200449610.

It is an arithmetic number, because the mean of its divisors is an integer number (10865200449610).

Almost surely, 2^{21730400899219} is an apocalyptic number.

21730400899219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21730400899219 is an equidigital number, since it uses as much as digits as its factorization.

21730400899219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 21730400899219 in words is "twenty-one trillion, seven hundred thirty billion, four hundred million, eight hundred ninety-nine thousand, two hundred nineteen".