21355366069 has 8 divisors (see below), whose sum is σ = 21676565088. Its totient is φ = 21034239600.

The previous prime is 21355366007. The next prime is 21355366091. The reversal of 21355366069 is 96066355312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21355366069 - 2¹¹ = 21355364021 is a prime.

It is a super-2 number, since 2×21355366069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355366099) 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, 1001214 + ... + 1022320.

It is an arithmetic number, because the mean of its divisors is an integer number (2709570636).

Almost surely, 2^21355366069 is an apocalyptic number.

It is an amenable number.

21355366069 is a deficient number, since it is larger than the sum of its proper divisors (321199019).

21355366069 is a wasteful number, since it uses less digits than its factorization.

21355366069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36275.

The product of its (nonzero) digits is 874800, while the sum is 46.

The spelling of 21355366069 in words is "twenty-one billion, three hundred fifty-five million, three hundred sixty-six thousand, sixty-nine".