21043325355 has 32 divisors (see below), whose sum is σ = 36523980864. Its totient is φ = 10284158976.

The previous prime is 21043325323. The next prime is 21043325371. The reversal of 21043325355 is 55352334012.

It is not a de Polignac number, because 21043325355 - 2⁵ = 21043325323 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 367134 + ... + 420563.

It is an arithmetic number, because the mean of its divisors is an integer number (1141374402).

Almost surely, 2^21043325355 is an apocalyptic number.

21043325355 is a deficient number, since it is larger than the sum of its proper divisors (15480655509).

21043325355 is a wasteful number, since it uses less digits than its factorization.

21043325355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787855.

The product of its (nonzero) digits is 54000, while the sum is 33.

Adding to 21043325355 its reverse (55352334012), we get a palindrome (76395659367).

The spelling of 21043325355 in words is "twenty-one billion, forty-three million, three hundred twenty-five thousand, three hundred fifty-five".