21355533320411 has 16 divisors (see below), whose sum is σ = 21873854956800. Its totient is φ = 20838205831968.

The previous prime is 21355533320383. The next prime is 21355533320447. The reversal of 21355533320411 is 11402333555312.

It is a cyclic number.

It is not a de Polignac number, because 21355533320411 - 2¹⁸ = 21355533058267 is a prime.

It is a super-3 number, since 3×21355533320411³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21355533326411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218334905 + ... + 218432693.

It is an arithmetic number, because the mean of its divisors is an integer number (1367115934800).

Almost surely, 2^{21355533320411} is an apocalyptic number.

21355533320411 is a deficient number, since it is larger than the sum of its proper divisors (518321636389).

21355533320411 is a wasteful number, since it uses less digits than its factorization.

21355533320411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102818.

The product of its (nonzero) digits is 162000, while the sum is 38.

Adding to 21355533320411 its reverse (11402333555312), we get a palindrome (32757866875723).

The spelling of 21355533320411 in words is "twenty-one trillion, three hundred fifty-five billion, five hundred thirty-three million, three hundred twenty thousand, four hundred eleven".