21019820092 has 6 divisors (see below), whose sum is σ = 36784685168. Its totient is φ = 10509910044.

The previous prime is 21019820089. The next prime is 21019820117. The reversal of 21019820092 is 29002891012.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2627477508 + ... + 2627477515.

Almost surely, 2^21019820092 is an apocalyptic number.

It is an amenable number.

21019820092 is a deficient number, since it is larger than the sum of its proper divisors (15764865076).

21019820092 is a wasteful number, since it uses less digits than its factorization.

21019820092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5254955027 (or 5254955025 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 21019820092 in words is "twenty-one billion, nineteen million, eight hundred twenty thousand, ninety-two".