1242121441 has 16 divisors (see below), whose sum is σ = 1366134336. Its totient is φ = 1120000000.

The previous prime is 1242121429. The next prime is 1242121459. The reversal of 1242121441 is 1441212421.

It is a 7-Lehmer number, since φ(1242121441) divides (1242121441-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 1242121441 - 2¹⁹ = 1241597153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242121411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775041 + ... + 776641.

It is an arithmetic number, because the mean of its divisors is an integer number (85383396).

Almost surely, 2^1242121441 is an apocalyptic number.

1242121441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242121441 is a deficient number, since it is larger than the sum of its proper divisors (124012895).

1242121441 is a wasteful number, since it uses less digits than its factorization.

1242121441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144.

The product of its digits is 512, while the sum is 22.

The square root of 1242121441 is about 35243.7432887030. The cubic root of 1242121441 is about 1074.9493946973.

Adding to 1242121441 its reverse (1441212421), we get a palindrome (2683333862).

The spelling of 1242121441 in words is "one billion, two hundred forty-two million, one hundred twenty-one thousand, four hundred forty-one".