21100019986 has 16 divisors (see below), whose sum is σ = 32675339520. Its totient is φ = 10208330640.

The previous prime is 21100019971. The next prime is 21100020001. The reversal of 21100019986 is 68991000112.

It is an interprime number because it is at equal distance from previous prime (21100019971) and next prime (21100020001).

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, 573580 + ... + 609256.

It is an arithmetic number, because the mean of its divisors is an integer number (2042208720).

Almost surely, 2^21100019986 is an apocalyptic number.

21100019986 is a deficient number, since it is larger than the sum of its proper divisors (11575319534).

21100019986 is a wasteful number, since it uses less digits than its factorization.

21100019986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45249.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 21100019986 in words is "twenty-one billion, one hundred million, nineteen thousand, nine hundred eighty-six".