21003351353 has 16 divisors (see below), whose sum is σ = 22001295360. Its totient is φ = 20026515600.

The previous prime is 21003351323. The next prime is 21003351359. The reversal of 21003351353 is 35315330012.

It is a cyclic number.

It is not a de Polignac number, because 21003351353 - 2⁶ = 21003351289 is a prime.

It is a super-2 number, since 2×21003351353² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003351359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1193726 + ... + 1211192.

It is an arithmetic number, because the mean of its divisors is an integer number (1375080960).

Almost surely, 2^21003351353 is an apocalyptic number.

It is an amenable number.

21003351353 is a deficient number, since it is larger than the sum of its proper divisors (997944007).

21003351353 is a wasteful number, since it uses less digits than its factorization.

21003351353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18068.

The product of its (nonzero) digits is 4050, while the sum is 26.

Adding to 21003351353 its reverse (35315330012), we get a palindrome (56318681365).

The spelling of 21003351353 in words is "twenty-one billion, three million, three hundred fifty-one thousand, three hundred fifty-three".