21730400899199 has 2 divisors, whose sum is σ = 21730400899200. Its totient is φ = 21730400899198.

The previous prime is 21730400899183. The next prime is 21730400899219. The reversal of 21730400899199 is 99199800403712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21730400899199 - 2⁴ = 21730400899183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21730400899099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10865200449599 + 10865200449600.

It is an arithmetic number, because the mean of its divisors is an integer number (10865200449600).

Almost surely, 2^{21730400899199} is an apocalyptic number.

21730400899199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21730400899199 is an equidigital number, since it uses as much as digits as its factorization.

21730400899199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The spelling of 21730400899199 in words is "twenty-one trillion, seven hundred thirty billion, four hundred million, eight hundred ninety-nine thousand, one hundred ninety-nine".