21190678982 has 16 divisors (see below), whose sum is σ = 34693302672. Its totient is φ = 9627225120.

The previous prime is 21190678979. The next prime is 21190679023. The reversal of 21190678982 is 28987609112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200693 + ... + 287504.

It is an arithmetic number, because the mean of its divisors is an integer number (2168331417).

Almost surely, 2^21190678982 is an apocalyptic number.

21190678982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21190678982 is a deficient number, since it is larger than the sum of its proper divisors (13502623690).

21190678982 is a wasteful number, since it uses less digits than its factorization.

21190678982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490183.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 21190678982 in words is "twenty-one billion, one hundred ninety million, six hundred seventy-eight thousand, nine hundred eighty-two".