1211210120231 has 4 divisors (see below), whose sum is σ = 1250281414464. Its totient is φ = 1172138826000.

The previous prime is 1211210120123. The next prime is 1211210120243. The reversal of 1211210120231 is 1320210121121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211210120231 is a prime.

It is a super-2 number, since 2×1211210120231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211210120831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19535647070 + ... + 19535647131.

It is an arithmetic number, because the mean of its divisors is an integer number (312570353616).

Almost surely, 2^{1211210120231} is an apocalyptic number.

1211210120231 is a deficient number, since it is larger than the sum of its proper divisors (39071294233).

1211210120231 is an equidigital number, since it uses as much as digits as its factorization.

1211210120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39071294232.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1211210120231 its reverse (1320210121121), we get a palindrome (2531420241352).

The spelling of 1211210120231 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty thousand, two hundred thirty-one".