21020052986 has 8 divisors (see below), whose sum is σ = 31534040340. Its totient is φ = 10508706208.

The previous prime is 21020052973. The next prime is 21020053111. The reversal of 21020052986 is 68925002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19219663225 + 1800389761 = 138635^2 + 42431^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 640121 + ... + 672156.

Almost surely, 2^21020052986 is an apocalyptic number.

21020052986 is a deficient number, since it is larger than the sum of its proper divisors (10513987354).

21020052986 is a wasteful number, since it uses less digits than its factorization.

21020052986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320288.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 21020052986 its reverse (68925002012), we get a palindrome (89945054998).

The spelling of 21020052986 in words is "twenty-one billion, twenty million, fifty-two thousand, nine hundred eighty-six".