1240204021 has 8 divisors (see below), whose sum is σ = 1420090304. Its totient is φ = 1060996320.

The previous prime is 1240204001. The next prime is 1240204037. The reversal of 1240204021 is 1204020421.

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 1240204021 - 2⁵ = 1240203989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240203986 and 1240204004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240204001) 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, 165720 + ... + 173041.

It is an arithmetic number, because the mean of its divisors is an integer number (177511288).

Almost surely, 2^1240204021 is an apocalyptic number.

It is an amenable number.

1240204021 is a deficient number, since it is larger than the sum of its proper divisors (179886283).

1240204021 is an equidigital number, since it uses as much as digits as its factorization.

1240204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339291.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1240204021 is about 35216.5305077033. The cubic root of 1240204021 is about 1074.3959890813.

Adding to 1240204021 its reverse (1204020421), we get a palindrome (2444224442).

The spelling of 1240204021 in words is "one billion, two hundred forty million, two hundred four thousand, twenty-one".