21434455420999 has 2 divisors, whose sum is σ = 21434455421000. Its totient is φ = 21434455420998.

The previous prime is 21434455420997. The next prime is 21434455421089. The reversal of 21434455420999 is 99902455443412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21434455420999 - 2¹ = 21434455420997 is a prime.

Together with 21434455420997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434455420997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717227710499 + 10717227710500.

It is an arithmetic number, because the mean of its divisors is an integer number (10717227710500).

Almost surely, 2^{21434455420999} is an apocalyptic number.

21434455420999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434455420999 is an equidigital number, since it uses as much as digits as its factorization.

21434455420999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55987200, while the sum is 61.

The spelling of 21434455420999 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred fifty-five million, four hundred twenty thousand, nine hundred ninety-nine".