21355343345511 has 48 divisors (see below), whose sum is σ = 37535517676800. Its totient is φ = 11421063293184.

The previous prime is 21355343345491. The next prime is 21355343345519. The reversal of 21355343345511 is 11554334355312.

21355343345511 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 53 + 43 + 3 + 4 + 551 + 1 = 666.

It is not a de Polignac number, because 21355343345511 - 2³³ = 21346753410919 is a prime.

It is a super-2 number, since 2×21355343345511² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355343345519) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55505581 + ... + 55888998.

It is an arithmetic number, because the mean of its divisors is an integer number (781989951600).

Almost surely, 2^{21355343345511} is an apocalyptic number.

21355343345511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21355343345511 is a deficient number, since it is larger than the sum of its proper divisors (16180174331289).

21355343345511 is a wasteful number, since it uses less digits than its factorization.

21355343345511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111394788 (or 111394785 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 45.

The spelling of 21355343345511 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-three million, three hundred forty-five thousand, five hundred eleven".