21000103525554 has 16 divisors (see below), whose sum is σ = 42213406074048. Its totient is φ = 6964501338032.

The previous prime is 21000103525553. The next prime is 21000103525561. The reversal of 21000103525554 is 45552530100012.

It is not an unprimeable number, because it can be changed into a prime (21000103525553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8883291342 + ... + 8883293705.

It is an arithmetic number, because the mean of its divisors is an integer number (2638337879628).

Almost surely, 2^{21000103525554} is an apocalyptic number.

21000103525554 is an abundant number, since it is smaller than the sum of its proper divisors (21213302548494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000103525554 is a wasteful number, since it uses less digits than its factorization.

21000103525554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17766585249.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 21000103525554 its reverse (45552530100012), we get a palindrome (66552633625566).

The spelling of 21000103525554 in words is "twenty-one trillion, one hundred three million, five hundred twenty-five thousand, five hundred fifty-four".