1212144231 has 4 divisors (see below), whose sum is σ = 1616192312. Its totient is φ = 808096152.

The previous prime is 1212144191. The next prime is 1212144239. The reversal of 1212144231 is 1324412121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1324412121 = 3 ⋅441470707.

It is not a de Polignac number, because 1212144231 - 2⁷ = 1212144103 is a prime.

It is a super-2 number, since 2×1212144231² = 2938587273493162722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212144198 and 1212144207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212144239) 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, 202024036 + ... + 202024041.

It is an arithmetic number, because the mean of its divisors is an integer number (404048078).

Almost surely, 2^1212144231 is an apocalyptic number.

1212144231 is a deficient number, since it is larger than the sum of its proper divisors (404048081).

1212144231 is an equidigital number, since it uses as much as digits as its factorization.

1212144231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404048080.

The product of its digits is 384, while the sum is 21.

The square root of 1212144231 is about 34815.8617730482. The cubic root of 1212144231 is about 1066.2313136246.

Adding to 1212144231 its reverse (1324412121), we get a palindrome (2536556352).

The spelling of 1212144231 in words is "one billion, two hundred twelve million, one hundred forty-four thousand, two hundred thirty-one".