21213543315111 has 8 divisors (see below), whose sum is σ = 32325399337344. Its totient is φ = 12122024751480.

The previous prime is 21213543315073. The next prime is 21213543315143. The reversal of 21213543315111 is 11151334531212.

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

It is not a de Polignac number, because 21213543315111 - 2³⁷ = 21076104361639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213543313111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505084364625 + ... + 505084364666.

It is an arithmetic number, because the mean of its divisors is an integer number (4040674917168).

Almost surely, 2^{21213543315111} is an apocalyptic number.

21213543315111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21213543315111 is a deficient number, since it is larger than the sum of its proper divisors (11111856022233).

21213543315111 is a wasteful number, since it uses less digits than its factorization.

21213543315111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010168729301.

The product of its digits is 10800, while the sum is 33.

Adding to 21213543315111 its reverse (11151334531212), we get a palindrome (32364877846323).

The spelling of 21213543315111 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand, one hundred eleven".