1211230311031 has 16 divisors (see below), whose sum is σ = 1322607275584. Its totient is φ = 1102537350144.

The previous prime is 1211230311013. The next prime is 1211230311047. The reversal of 1211230311031 is 1301130321121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211230311031 is a prime.

It is a super-2 number, since 2×1211230311031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211230311001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1384515 + ... + 2083108.

It is an arithmetic number, because the mean of its divisors is an integer number (82662954724).

Almost surely, 2^{1211230311031} is an apocalyptic number.

1211230311031 is a deficient number, since it is larger than the sum of its proper divisors (111376964553).

1211230311031 is a wasteful number, since it uses less digits than its factorization.

1211230311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468010.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1211230311031 its reverse (1301130321121), we get a palindrome (2512360632152).

The spelling of 1211230311031 in words is "one trillion, two hundred eleven billion, two hundred thirty million, three hundred eleven thousand, thirty-one".