21011344355 has 16 divisors (see below), whose sum is σ = 25687531200. Its totient is φ = 16495446528.

The previous prime is 21011344303. The next prime is 21011344363. The reversal of 21011344355 is 55344311012.

It is a cyclic number.

It is not a de Polignac number, because 21011344355 - 2¹⁴ = 21011327971 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72002 + ... + 217271.

It is an arithmetic number, because the mean of its divisors is an integer number (1605470700).

Almost surely, 2^21011344355 is an apocalyptic number.

21011344355 is a deficient number, since it is larger than the sum of its proper divisors (4676186845).

21011344355 is a wasteful number, since it uses less digits than its factorization.

21011344355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289550.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21011344355 its reverse (55344311012), we get a palindrome (76355655367).

The spelling of 21011344355 in words is "twenty-one billion, eleven million, three hundred forty-four thousand, three hundred fifty-five".