21366900831 has 8 divisors (see below), whose sum is σ = 28680404400. Its totient is φ = 14148998912.

The previous prime is 21366900827. The next prime is 21366900871. The reversal of 21366900831 is 13800966312.

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 21366900831 - 2² = 21366900827 is a prime.

It is a super-2 number, since 2×21366900831² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21366900831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366900871) 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, 23899890 + ... + 23900783.

It is an arithmetic number, because the mean of its divisors is an integer number (3585050550).

Almost surely, 2^21366900831 is an apocalyptic number.

21366900831 is a deficient number, since it is larger than the sum of its proper divisors (7313503569).

21366900831 is a wasteful number, since it uses less digits than its factorization.

21366900831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47800825.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21366900831 in words is "twenty-one billion, three hundred sixty-six million, nine hundred thousand, eight hundred thirty-one".