21443512312099 has 2 divisors, whose sum is σ = 21443512312100. Its totient is φ = 21443512312098.

The previous prime is 21443512312093. The next prime is 21443512312109. The reversal of 21443512312099 is 99021321534412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21443512312099 - 2³³ = 21434922377507 is a prime.

It is not a weakly prime, because it can be changed into another prime (21443512312093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721756156049 + 10721756156050.

It is an arithmetic number, because the mean of its divisors is an integer number (10721756156050).

Almost surely, 2^{21443512312099} is an apocalyptic number.

21443512312099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443512312099 is an equidigital number, since it uses as much as digits as its factorization.

21443512312099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 21443512312099 in words is "twenty-one trillion, four hundred forty-three billion, five hundred twelve million, three hundred twelve thousand, ninety-nine".