21013212986 has 16 divisors (see below), whose sum is σ = 32436201600. Its totient is φ = 10204559040.

The previous prime is 21013212947. The next prime is 21013213019. The reversal of 21013212986 is 68921231012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840911 + ... + 865538.

It is an arithmetic number, because the mean of its divisors is an integer number (2027262600).

Almost surely, 2^21013212986 is an apocalyptic number.

21013212986 is a deficient number, since it is larger than the sum of its proper divisors (11422988614).

21013212986 is a wasteful number, since it uses less digits than its factorization.

21013212986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706629.

The product of its (nonzero) digits is 10368, while the sum is 35.

Adding to 21013212986 its reverse (68921231012), we get a palindrome (89934443998).

The spelling of 21013212986 in words is "twenty-one billion, thirteen million, two hundred twelve thousand, nine hundred eighty-six".