21938587682 has 12 divisors (see below), whose sum is σ = 36171473478. Its totient is φ = 9972085200.

The previous prime is 21938587673. The next prime is 21938587721. The reversal of 21938587682 is 28678583912.

It can be written as a sum of positive squares in only one way, i.e., 21853413241 + 85174441 = 147829^2 + 9229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45327419 + ... + 45327902.

Almost surely, 2^21938587682 is an apocalyptic number.

21938587682 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21938587682 is a deficient number, since it is larger than the sum of its proper divisors (14232885796).

21938587682 is a wasteful number, since it uses less digits than its factorization.

21938587682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90655345 (or 90655334 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 59.

The spelling of 21938587682 in words is "twenty-one billion, nine hundred thirty-eight million, five hundred eighty-seven thousand, six hundred eighty-two".