1213122142 has 16 divisors (see below), whose sum is σ = 1993163760. Its totient is φ = 551195008.

The previous prime is 1213122139. The next prime is 1213122179. The reversal of 1213122142 is 2412213121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614188 + ... + 616159.

It is an arithmetic number, because the mean of its divisors is an integer number (124572735).

Almost surely, 2^1213122142 is an apocalyptic number.

1213122142 is a deficient number, since it is larger than the sum of its proper divisors (780041618).

1213122142 is a wasteful number, since it uses less digits than its factorization.

1213122142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230395.

The product of its digits is 192, while the sum is 19.

The square root of 1213122142 is about 34829.9029857966. The cubic root of 1213122142 is about 1066.5179679218.

Adding to 1213122142 its reverse (2412213121), we get a palindrome (3625335263).

The spelling of 1213122142 in words is "one billion, two hundred thirteen million, one hundred twenty-two thousand, one hundred forty-two".