21013113355 has 32 divisors (see below), whose sum is σ = 27399181824. Its totient is φ = 15378702336.

The previous prime is 21013113349. The next prime is 21013113367. The reversal of 21013113355 is 55331131012.

It is a cyclic number.

It is not a de Polignac number, because 21013113355 - 2⁷ = 21013113227 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3471942 + ... + 3477988.

It is an arithmetic number, because the mean of its divisors is an integer number (856224432).

Almost surely, 2^21013113355 is an apocalyptic number.

21013113355 is a deficient number, since it is larger than the sum of its proper divisors (6386068469).

21013113355 is a wasteful number, since it uses less digits than its factorization.

21013113355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6535.

The product of its (nonzero) digits is 1350, while the sum is 25.

Adding to 21013113355 its reverse (55331131012), we get a palindrome (76344244367).

The spelling of 21013113355 in words is "twenty-one billion, thirteen million, one hundred thirteen thousand, three hundred fifty-five".