21375552369 has 8 divisors (see below), whose sum is σ = 28507061440. Its totient is φ = 14247205776.

The previous prime is 21375552337. The next prime is 21375552371. The reversal of 21375552369 is 96325557312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21375552369 - 2⁵ = 21375552337 is a prime.

It is a super-2 number, since 2×21375552369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375552329) 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 7 ways as a sum of consecutive naturals, for example, 774802 + ... + 801915.

It is an arithmetic number, because the mean of its divisors is an integer number (3563382680).

Almost surely, 2^21375552369 is an apocalyptic number.

It is an amenable number.

21375552369 is a deficient number, since it is larger than the sum of its proper divisors (7131509071).

21375552369 is a wasteful number, since it uses less digits than its factorization.

21375552369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581239.

The product of its digits is 1701000, while the sum is 48.

The spelling of 21375552369 in words is "twenty-one billion, three hundred seventy-five million, five hundred fifty-two thousand, three hundred sixty-nine".