1211351242156 has 12 divisors (see below), whose sum is σ = 2312579644200. Its totient is φ = 550614200960.

The previous prime is 1211351242141. The next prime is 1211351242163. The reversal of 1211351242156 is 6512421531121.

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, 13765354981 + ... + 13765355068.

It is an arithmetic number, because the mean of its divisors is an integer number (192714970350).

Almost surely, 2^{1211351242156} is an apocalyptic number.

It is an amenable number.

1211351242156 is a deficient number, since it is larger than the sum of its proper divisors (1101228402044).

1211351242156 is a wasteful number, since it uses less digits than its factorization.

1211351242156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27530710064 (or 27530710062 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

Adding to 1211351242156 its reverse (6512421531121), we get a palindrome (7723772773277).

The spelling of 1211351242156 in words is "one trillion, two hundred eleven billion, three hundred fifty-one million, two hundred forty-two thousand, one hundred fifty-six".