1242220111 has 4 divisors (see below), whose sum is σ = 1355149224. Its totient is φ = 1129291000.

The previous prime is 1242220103. The next prime is 1242220123. The reversal of 1242220111 is 1110222421.

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 1242220111 - 2³ = 1242220103 is a prime.

It is a super-3 number, since 3×1242220111³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242220151) 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, 56464540 + ... + 56464561.

It is an arithmetic number, because the mean of its divisors is an integer number (338787306).

Almost surely, 2^1242220111 is an apocalyptic number.

1242220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1242220111 is a deficient number, since it is larger than the sum of its proper divisors (112929113).

1242220111 is a wasteful number, since it uses less digits than its factorization.

1242220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112929112.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1242220111 is about 35245.1430838350. The cubic root of 1242220111 is about 1074.9778574130.

Adding to 1242220111 its reverse (1110222421), we get a palindrome (2352442532).

The spelling of 1242220111 in words is "one billion, two hundred forty-two million, two hundred twenty thousand, one hundred eleven".