21000353538886 has 8 divisors (see below), whose sum is σ = 31806360699984. Its totient is φ = 10398233305560.

The previous prime is 21000353538883. The next prime is 21000353538893. The reversal of 21000353538886 is 68883535300012.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000353538883) 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, 50971731685 + ... + 50971732096.

It is an arithmetic number, because the mean of its divisors is an integer number (3975795087498).

Almost surely, 2^{21000353538886} is an apocalyptic number.

21000353538886 is a deficient number, since it is larger than the sum of its proper divisors (10806007161098).

21000353538886 is a wasteful number, since it uses less digits than its factorization.

21000353538886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101943463886.

The product of its (nonzero) digits is 4147200, while the sum is 52.

Adding to 21000353538886 its reverse (68883535300012), we get a palindrome (89883888838898).

The spelling of 21000353538886 in words is "twenty-one trillion, three hundred fifty-three million, five hundred thirty-eight thousand, eight hundred eighty-six".