21661042630024 has 64 divisors (see below), whose sum is σ = 46544342083200. Its totient is φ = 9257748288000.

The previous prime is 21661042630021. The next prime is 21661042630037. The reversal of 21661042630024 is 42003624016612.

It is not an unprimeable number, because it can be changed into a prime (21661042630021) 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, 123013404 + ... + 123189364.

It is an arithmetic number, because the mean of its divisors is an integer number (727255345050).

Almost surely, 2^{21661042630024} is an apocalyptic number.

It is an amenable number.

21661042630024 is an abundant number, since it is smaller than the sum of its proper divisors (24883299453176).

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

21661042630024 is a wasteful number, since it uses less digits than its factorization.

21661042630024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182014 (or 182010 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 21661042630024 its reverse (42003624016612), we get a palindrome (63664666646636).

The spelling of 21661042630024 in words is "twenty-one trillion, six hundred sixty-one billion, forty-two million, six hundred thirty thousand, twenty-four".