21005510412030 has 64 divisors (see below), whose sum is σ = 50449102380288. Its totient is φ = 5597483843840.

The previous prime is 21005510412023. The next prime is 21005510412071. The reversal of 21005510412030 is 3021401550012.

It is a happy number.

It is a congruent number.

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, 602152969 + ... + 602187851.

It is an arithmetic number, because the mean of its divisors is an integer number (788267224692).

Almost surely, 2^{21005510412030} is an apocalyptic number.

21005510412030 is an abundant number, since it is smaller than the sum of its proper divisors (29443591968258).

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

21005510412030 is a wasteful number, since it uses less digits than its factorization.

21005510412030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48601.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21005510412030 its reverse (3021401550012), we get a palindrome (24026911962042).

The spelling of 21005510412030 in words is "twenty-one trillion, five billion, five hundred ten million, four hundred twelve thousand, thirty".