1211103412431 has 24 divisors (see below), whose sum is σ = 1778070179760. Its totient is φ = 732711957120.

The previous prime is 1211103412399. The next prime is 1211103412501. The reversal of 1211103412431 is 1342143011121.

It is not a de Polignac number, because 1211103412431 - 2⁵ = 1211103412399 is a prime.

It is a super-2 number, since 2×1211103412431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211103417431) 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, 2725240 + ... + 3138333.

It is an arithmetic number, because the mean of its divisors is an integer number (74086257490).

Almost surely, 2^{1211103412431} is an apocalyptic number.

1211103412431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211103412431 is a deficient number, since it is larger than the sum of its proper divisors (566966767329).

1211103412431 is a wasteful number, since it uses less digits than its factorization.

1211103412431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5864167 (or 5864156 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 1211103412431 its reverse (1342143011121), we get a palindrome (2553246423552).

The spelling of 1211103412431 in words is "one trillion, two hundred eleven billion, one hundred three million, four hundred twelve thousand, four hundred thirty-one".