21019018786 has 16 divisors (see below), whose sum is σ = 32902833600. Its totient is φ = 10051504848.

The previous prime is 21019018723. The next prime is 21019018843. The reversal of 21019018786 is 68781091012.

It is a happy 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, 568060 + ... + 603928.

It is an arithmetic number, because the mean of its divisors is an integer number (2056427100).

Almost surely, 2^21019018786 is an apocalyptic number.

21019018786 is a deficient number, since it is larger than the sum of its proper divisors (11883814814).

21019018786 is a wasteful number, since it uses less digits than its factorization.

21019018786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48633.

The product of its (nonzero) digits is 48384, while the sum is 43.

The spelling of 21019018786 in words is "twenty-one billion, nineteen million, eighteen thousand, seven hundred eighty-six".