21103355315 has 32 divisors (see below), whose sum is σ = 29725470720. Its totient is φ = 14081526144.

The previous prime is 21103355279. The next prime is 21103355333. The reversal of 21103355315 is 51355330112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21103355315 is a prime.

It is a super-2 number, since 2×21103355315² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 378782 + ... + 430908.

It is an arithmetic number, because the mean of its divisors is an integer number (928920960).

Almost surely, 2^21103355315 is an apocalyptic number.

21103355315 is a deficient number, since it is larger than the sum of its proper divisors (8622115405).

21103355315 is a wasteful number, since it uses less digits than its factorization.

21103355315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52451.

The product of its (nonzero) digits is 6750, while the sum is 29.

Adding to 21103355315 its reverse (51355330112), we get a palindrome (72458685427).

The spelling of 21103355315 in words is "twenty-one billion, one hundred three million, three hundred fifty-five thousand, three hundred fifteen".