21003056354 has 16 divisors (see below), whose sum is σ = 36615499200. Its totient is φ = 8848744944.

The previous prime is 21003056281. The next prime is 21003056359. The reversal of 21003056354 is 45365030012.

It is a super-2 number, since 2×21003056354² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003056359) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12712889 + ... + 12714540.

It is an arithmetic number, because the mean of its divisors is an integer number (2288468700).

Almost surely, 2^21003056354 is an apocalyptic number.

21003056354 is a deficient number, since it is larger than the sum of its proper divisors (15612442846).

21003056354 is a wasteful number, since it uses less digits than its factorization.

21003056354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25427497.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21003056354 its reverse (45365030012), we get a palindrome (66368086366).

The spelling of 21003056354 in words is "twenty-one billion, three million, fifty-six thousand, three hundred fifty-four".