1211103213231 has 16 divisors (see below), whose sum is σ = 1660083452928. Its totient is φ = 784990092000.

The previous prime is 1211103213227. The next prime is 1211103213241. The reversal of 1211103213231 is 1323123011121.

It is not a de Polignac number, because 1211103213231 - 2² = 1211103213227 is a prime.

It is a super-2 number, since 2×1211103213231² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211103213198 and 1211103213207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211103213241) 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, 28420380 + ... + 28462961.

It is an arithmetic number, because the mean of its divisors is an integer number (103755215808).

Almost surely, 2^{1211103213231} is an apocalyptic number.

1211103213231 is a deficient number, since it is larger than the sum of its proper divisors (448980239697).

1211103213231 is a wasteful number, since it uses less digits than its factorization.

1211103213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56883542.

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

Adding to 1211103213231 its reverse (1323123011121), we get a palindrome (2534226224352).

The spelling of 1211103213231 in words is "one trillion, two hundred eleven billion, one hundred three million, two hundred thirteen thousand, two hundred thirty-one".