21000000000986 has 8 divisors (see below), whose sum is σ = 31602605865600. Its totient is φ = 10465798045788.

The previous prime is 21000000000983. The next prime is 21000000001003. The reversal of 21000000000986 is 68900000000012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21000000000983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17100976586 + ... + 17100977813.

It is an arithmetic number, because the mean of its divisors is an integer number (3950325733200).

Almost surely, 2^{21000000000986} is an apocalyptic number.

21000000000986 is a deficient number, since it is larger than the sum of its proper divisors (10602605864614).

21000000000986 is a wasteful number, since it uses less digits than its factorization.

21000000000986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34201954708.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 21000000000986 its reverse (68900000000012), we get a palindrome (89900000000998).

The spelling of 21000000000986 in words is "twenty-one trillion, nine hundred eighty-six", and thus it is an aban number.