21437442747599 has 2 divisors, whose sum is σ = 21437442747600. Its totient is φ = 21437442747598.

The previous prime is 21437442747571. The next prime is 21437442747613. The reversal of 21437442747599 is 99574724473412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21437442747599 - 2¹⁶ = 21437442682063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21437442747509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718721373799 + 10718721373800.

It is an arithmetic number, because the mean of its divisors is an integer number (10718721373800).

Almost surely, 2^{21437442747599} is an apocalyptic number.

21437442747599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21437442747599 is an equidigital number, since it uses as much as digits as its factorization.

21437442747599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 426746880, while the sum is 68.

The spelling of 21437442747599 in words is "twenty-one trillion, four hundred thirty-seven billion, four hundred forty-two million, seven hundred forty-seven thousand, five hundred ninety-nine".