21355343020445 has 64 divisors (see below), whose sum is σ = 30864458612736. Its totient is φ = 13878645338880.

The previous prime is 21355343020441. The next prime is 21355343020463. The reversal of 21355343020445 is 54402034355312.

It is not a de Polignac number, because 21355343020445 - 2² = 21355343020441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355343020441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12011084 + ... + 13673946.

It is an arithmetic number, because the mean of its divisors is an integer number (482257165824).

Almost surely, 2^{21355343020445} is an apocalyptic number.

It is an amenable number.

21355343020445 is a deficient number, since it is larger than the sum of its proper divisors (9509115592291).

21355343020445 is a wasteful number, since it uses less digits than its factorization.

21355343020445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663170.

The product of its (nonzero) digits is 864000, while the sum is 41.

Adding to 21355343020445 its reverse (54402034355312), we get a palindrome (75757377375757).

The spelling of 21355343020445 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-three million, twenty thousand, four hundred forty-five".