21261162130030 has 32 divisors (see below), whose sum is σ = 38942057858400. Its totient is φ = 8355311812992.

The previous prime is 21261162130001. The next prime is 21261162130051. The reversal of 21261162130030 is 3003126116212.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9810937 + ... + 11780356.

It is an arithmetic number, because the mean of its divisors is an integer number (1216939308075).

Almost surely, 2^{21261162130030} is an apocalyptic number.

21261162130030 is a deficient number, since it is larger than the sum of its proper divisors (17680895728370).

21261162130030 is a wasteful number, since it uses less digits than its factorization.

21261162130030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21593028.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 21261162130030 its reverse (3003126116212), we get a palindrome (24264288246242).

The spelling of 21261162130030 in words is "twenty-one trillion, two hundred sixty-one billion, one hundred sixty-two million, one hundred thirty thousand, thirty".