21676440136 has 32 divisors (see below), whose sum is σ = 44063523000. Its totient is φ = 9937359360.

The previous prime is 21676440131. The next prime is 21676440139. The reversal of 21676440136 is 63104467612.

It can be written as a sum of positive squares in 4 ways, for example, as 15033212100 + 6643228036 = 122610^2 + 81506^2 .

It is a super-3 number, since 3×21676440136³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21676440131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683925 + ... + 714916.

Almost surely, 2^21676440136 is an apocalyptic number.

21676440136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21676440136 is an abundant number, since it is smaller than the sum of its proper divisors (22387082864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21676440136 is a wasteful number, since it uses less digits than its factorization.

21676440136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399009 (or 1399005 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 21676440136 in words is "twenty-one billion, six hundred seventy-six million, four hundred forty thousand, one hundred thirty-six".