1421240121 has 16 divisors (see below), whose sum is σ = 2406332800. Its totient is φ = 812137104.

The previous prime is 1421240089. The next prime is 1421240179. The reversal of 1421240121 is 1210421241.

1421240121 is a `hidden beast` number, since 1 + 421 + 240 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 1421240121 - 2⁵ = 1421240089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421240094 and 1421240103.

It is not an unprimeable number, because it can be changed into a prime (1421240221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3759706 + ... + 3760083.

It is an arithmetic number, because the mean of its divisors is an integer number (150395800).

Almost surely, 2^1421240121 is an apocalyptic number.

It is an amenable number.

1421240121 is a deficient number, since it is larger than the sum of its proper divisors (985092679).

1421240121 is an equidigital number, since it uses as much as digits as its factorization.

1421240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7519805 (or 7519799 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1421240121 is about 37699.3384689970. The cubic root of 1421240121 is about 1124.3179723843.

Adding to 1421240121 its reverse (1210421241), we get a palindrome (2631661362).

The spelling of 1421240121 in words is "one billion, four hundred twenty-one million, two hundred forty thousand, one hundred twenty-one".