21123131230222 has 32 divisors (see below), whose sum is σ = 36264310939584. Its totient is φ = 9039464448000.

The previous prime is 21123131230219. The next prime is 21123131230237. The reversal of 21123131230222 is 22203213132112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408442638 + ... + 408494350.

It is an arithmetic number, because the mean of its divisors is an integer number (1133259716862).

Almost surely, 2^{21123131230222} is an apocalyptic number.

21123131230222 is a deficient number, since it is larger than the sum of its proper divisors (15141179709362).

21123131230222 is a wasteful number, since it uses less digits than its factorization.

21123131230222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94044.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21123131230222 its reverse (22203213132112), we get a palindrome (43326344362334).

The spelling of 21123131230222 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred thirty-one million, two hundred thirty thousand, two hundred twenty-two".