1242120011 has 8 divisors (see below), whose sum is σ = 1434748464. Its totient is φ = 1062776320.

The previous prime is 1242120001. The next prime is 1242120023. The reversal of 1242120011 is 1100212421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242120011 - 2¹⁸ = 1241857867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242120001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3320990 + ... + 3321363.

It is an arithmetic number, because the mean of its divisors is an integer number (179343558).

Almost surely, 2^1242120011 is an apocalyptic number.

1242120011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1242120011 is a deficient number, since it is larger than the sum of its proper divisors (192628453).

1242120011 is a wasteful number, since it uses less digits than its factorization.

1242120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642381.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1242120011 is about 35243.7230014084. The cubic root of 1242120011 is about 1074.9489821831.

Adding to 1242120011 its reverse (1100212421), we get a palindrome (2342332432).

The spelling of 1242120011 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, eleven".