1211231513012 has 12 divisors (see below), whose sum is σ = 2122397268516. Its totient is φ = 604832293440.

The previous prime is 1211231512991. The next prime is 1211231513039. The reversal of 1211231513012 is 2103151321121.

It can be written as a sum of positive squares in 2 ways, for example, as 162315517456 + 1048915995556 = 402884^2 + 1024166^2 .

It is a super-2 number, since 2×1211231513012² (a number of 25 digits) contains 22 as substring.

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, 195862289 + ... + 195868472.

It is an arithmetic number, because the mean of its divisors is an integer number (176866439043).

Almost surely, 2^{1211231513012} is an apocalyptic number.

It is an amenable number.

1211231513012 is a deficient number, since it is larger than the sum of its proper divisors (911165755504).

1211231513012 is a wasteful number, since it uses less digits than its factorization.

1211231513012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391731538 (or 391731536 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 1211231513012 its reverse (2103151321121), we get a palindrome (3314382834133).

The spelling of 1211231513012 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, five hundred thirteen thousand, twelve".