1211216142 has 32 divisors (see below), whose sum is σ = 2552469120. Its totient is φ = 382108320.

The previous prime is 1211216141. The next prime is 1211216143. The reversal of 1211216142 is 2416121121.

It is an interprime number because it is at equal distance from previous prime (1211216141) and next prime (1211216143).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211216141) 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, 123292 + ... + 132752.

It is an arithmetic number, because the mean of its divisors is an integer number (79764660).

Almost surely, 2^1211216142 is an apocalyptic number.

1211216142 is an abundant number, since it is smaller than the sum of its proper divisors (1341252978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211216142 is a wasteful number, since it uses less digits than its factorization.

1211216142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10608.

The product of its digits is 192, while the sum is 21.

The square root of 1211216142 is about 34802.5306838454. The cubic root of 1211216142 is about 1065.9591209844.

Adding to 1211216142 its reverse (2416121121), we get a palindrome (3627337263).

The spelling of 1211216142 in words is "one billion, two hundred eleven million, two hundred sixteen thousand, one hundred forty-two".