21740841511509 has 32 divisors (see below), whose sum is σ = 29749123113984. Its totient is φ = 14118956691840.

The previous prime is 21740841511453. The next prime is 21740841511517. The reversal of 21740841511509 is 90511514804712.

It is not a de Polignac number, because 21740841511509 - 2¹³ = 21740841503317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740841511409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6354832 + ... + 9157814.

It is an arithmetic number, because the mean of its divisors is an integer number (929660097312).

Almost surely, 2^{21740841511509} is an apocalyptic number.

It is an amenable number.

21740841511509 is a deficient number, since it is larger than the sum of its proper divisors (8008281602475).

21740841511509 is a wasteful number, since it uses less digits than its factorization.

21740841511509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803497.

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 21740841511509 in words is "twenty-one trillion, seven hundred forty billion, eight hundred forty-one million, five hundred eleven thousand, five hundred nine".