1211323142 has 4 divisors (see below), whose sum is σ = 1816984716. Its totient is φ = 605661570.

The previous prime is 1211323103. The next prime is 1211323163. The reversal of 1211323142 is 2413231121.

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

It is a super-3 number, since 3×1211323142³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302830784 + ... + 302830787.

It is an arithmetic number, because the mean of its divisors is an integer number (454246179).

Almost surely, 2^1211323142 is an apocalyptic number.

1211323142 is a deficient number, since it is larger than the sum of its proper divisors (605661574).

1211323142 is an equidigital number, since it uses as much as digits as its factorization.

1211323142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605661573.

The product of its digits is 288, while the sum is 20.

The square root of 1211323142 is about 34804.0678944287. The cubic root of 1211323142 is about 1065.9905093451.

Adding to 1211323142 its reverse (2413231121), we get a palindrome (3624554263).

The spelling of 1211323142 in words is "one billion, two hundred eleven million, three hundred twenty-three thousand, one hundred forty-two".