1204454021 has 4 divisors (see below), whose sum is σ = 1208377632. Its totient is φ = 1200530412.

The previous prime is 1204453979. The next prime is 1204454039. The reversal of 1204454021 is 1204544021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1204454021 - 2²² = 1200259717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204454221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1961345 + ... + 1961958.

It is an arithmetic number, because the mean of its divisors is an integer number (302094408).

Almost surely, 2^1204454021 is an apocalyptic number.

It is an amenable number.

1204454021 is a deficient number, since it is larger than the sum of its proper divisors (3923611).

1204454021 is an equidigital number, since it uses as much as digits as its factorization.

1204454021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923610.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1204454021 is about 34705.2448629886. The cubic root of 1204454021 is about 1063.9716968770.

Adding to 1204454021 its reverse (1204544021), we get a palindrome (2408998042).

Subtracting 1204454021 from its reverse (1204544021), we obtain a square (90000 = 300²).

The spelling of 1204454021 in words is "one billion, two hundred four million, four hundred fifty-four thousand, twenty-one".