1231121012 has 12 divisors (see below), whose sum is σ = 2350322016. Its totient is φ = 559600440.

The previous prime is 1231120999. The next prime is 1231121039. The reversal of 1231121012 is 2101211321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13989968 + ... + 13990055.

It is an arithmetic number, because the mean of its divisors is an integer number (195860168).

Almost surely, 2^1231121012 is an apocalyptic number.

It is an amenable number.

1231121012 is a deficient number, since it is larger than the sum of its proper divisors (1119201004).

1231121012 is a wasteful number, since it uses less digits than its factorization.

1231121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27980038 (or 27980036 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1231121012 is about 35087.3340680081. The cubic root of 1231121012 is about 1071.7666718086.

Adding to 1231121012 its reverse (2101211321), we get a palindrome (3332332333).

The spelling of 1231121012 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, twelve".