1211012311131 has 24 divisors (see below), whose sum is σ = 2053162017504. Its totient is φ = 673304140800.

The previous prime is 1211012311123. The next prime is 1211012311147. The reversal of 1211012311131 is 1311132101121.

1211012311131 is a `hidden beast` number, since 1 + 211 + 0 + 12 + 311 + 131 = 666.

It is not a de Polignac number, because 1211012311131 - 2³ = 1211012311123 is a prime.

It is a super-2 number, since 2×1211012311131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211012311031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259760070 + ... + 259764731.

It is an arithmetic number, because the mean of its divisors is an integer number (85548417396).

Almost surely, 2^{1211012311131} is an apocalyptic number.

1211012311131 is a deficient number, since it is larger than the sum of its proper divisors (842149706373).

1211012311131 is a wasteful number, since it uses less digits than its factorization.

1211012311131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519524851 (or 519524848 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 1211012311131 its reverse (1311132101121), we get a palindrome (2522144412252).

The spelling of 1211012311131 in words is "one trillion, two hundred eleven billion, twelve million, three hundred eleven thousand, one hundred thirty-one".