1213121230131 has 16 divisors (see below), whose sum is σ = 1618181903360. Its totient is φ = 808404114240.

The previous prime is 1213121230129. The next prime is 1213121230157. The reversal of 1213121230131 is 1310321213121.

It is not a de Polignac number, because 1213121230131 - 2¹ = 1213121230129 is a prime.

It is a super-2 number, since 2×1213121230131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213121230098 and 1213121230107.

It is not an unprimeable number, because it can be changed into a prime (1213121230031) 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, 125330550 + ... + 125340228.

It is an arithmetic number, because the mean of its divisors is an integer number (101136368960).

Almost surely, 2^{1213121230131} is an apocalyptic number.

1213121230131 is a deficient number, since it is larger than the sum of its proper divisors (405060673229).

1213121230131 is an equidigital number, since it uses as much as digits as its factorization.

1213121230131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23106.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1213121230131 its reverse (1310321213121), we get a palindrome (2523442443252).

The spelling of 1213121230131 in words is "one trillion, two hundred thirteen billion, one hundred twenty-one million, two hundred thirty thousand, one hundred thirty-one".