1211202121131 has 48 divisors (see below), whose sum is σ = 1802796091200. Its totient is φ = 783026749440.

The previous prime is 1211202121069. The next prime is 1211202121153. The reversal of 1211202121131 is 1311212021121.

It is a happy number.

1211202121131 is a `hidden beast` number, since 1 + 211 + 202 + 121 + 131 = 666.

It is not a de Polignac number, because 1211202121131 - 2⁶ = 1211202121067 is a prime.

It is a super-2 number, since 2×1211202121131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211202129131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 127853611 + ... + 127863083.

It is an arithmetic number, because the mean of its divisors is an integer number (37558251900).

Almost surely, 2^{1211202121131} is an apocalyptic number.

1211202121131 is a deficient number, since it is larger than the sum of its proper divisors (591593970069).

1211202121131 is a wasteful number, since it uses less digits than its factorization.

1211202121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756 (or 10753 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211202121131 its reverse (1311212021121), we get a palindrome (2522414142252).

The spelling of 1211202121131 in words is "one trillion, two hundred eleven billion, two hundred two million, one hundred twenty-one thousand, one hundred thirty-one".