1212012143 has 4 divisors (see below), whose sum is σ = 1212180408. Its totient is φ = 1211843880.

The previous prime is 1212012121. The next prime is 1212012169. The reversal of 1212012143 is 3412102121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212012143 - 2⁶ = 1212012079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212012173) 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, 72821 + ... + 87902.

It is an arithmetic number, because the mean of its divisors is an integer number (303045102).

Almost surely, 2^1212012143 is an apocalyptic number.

1212012143 is a deficient number, since it is larger than the sum of its proper divisors (168265).

1212012143 is an equidigital number, since it uses as much as digits as its factorization.

1212012143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168264.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1212012143 is about 34813.9647699023. The cubic root of 1212012143 is about 1066.1925829537.

Adding to 1212012143 its reverse (3412102121), we get a palindrome (4624114264).

The spelling of 1212012143 in words is "one billion, two hundred twelve million, twelve thousand, one hundred forty-three".