231221130123212 has 6 divisors (see below), whose sum is σ = 404636977715628. Its totient is φ = 115610565061604.

The previous prime is 231221130123209. The next prime is 231221130123251. The reversal of 231221130123212 is 212321031122132.

It is a super-2 number, since 2×231221130123212² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28902641265398 + ... + 28902641265405.

It is an arithmetic number, because the mean of its divisors is an integer number (67439496285938).

Almost surely, 2^{231221130123212} is an apocalyptic number.

It is an amenable number.

231221130123212 is a deficient number, since it is larger than the sum of its proper divisors (173415847592416).

231221130123212 is a wasteful number, since it uses less digits than its factorization.

231221130123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57805282530807 (or 57805282530805 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 231221130123212 its reverse (212321031122132), we get a palindrome (443542161245344).

The spelling of 231221130123212 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, one hundred thirty million, one hundred twenty-three thousand, two hundred twelve".