21573979341 has 16 divisors (see below), whose sum is σ = 28823760000. Its totient is φ = 14353456320.

The previous prime is 21573979337. The next prime is 21573979363. The reversal of 21573979341 is 14397937512.

It is not a de Polignac number, because 21573979341 - 2² = 21573979337 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 (21573979321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4313160 + ... + 4318158.

It is an arithmetic number, because the mean of its divisors is an integer number (1801485000).

Almost surely, 2^21573979341 is an apocalyptic number.

It is an amenable number.

21573979341 is a deficient number, since it is larger than the sum of its proper divisors (7249780659).

21573979341 is a wasteful number, since it uses less digits than its factorization.

21573979341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7636.

The product of its digits is 1428840, while the sum is 51.

The spelling of 21573979341 in words is "twenty-one billion, five hundred seventy-three million, nine hundred seventy-nine thousand, three hundred forty-one".