1204152421 has 4 divisors (see below), whose sum is σ = 1226872332. Its totient is φ = 1181432512.

The previous prime is 1204152409. The next prime is 1204152431. The reversal of 1204152421 is 1242514021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 471367521 + 732784900 = 21711^2 + 27070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204152421 - 2²¹ = 1202055269 is a prime.

It is a super-2 number, since 2×1204152421² = 2899966106000322482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204152392 and 1204152401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204152431) 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, 11359876 + ... + 11359981.

It is an arithmetic number, because the mean of its divisors is an integer number (306718083).

Almost surely, 2^1204152421 is an apocalyptic number.

It is an amenable number.

1204152421 is a deficient number, since it is larger than the sum of its proper divisors (22719911).

1204152421 is an equidigital number, since it uses as much as digits as its factorization.

1204152421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22719910.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1204152421 is about 34700.8994263837. The cubic root of 1204152421 is about 1063.8828819046.

Adding to 1204152421 its reverse (1242514021), we get a palindrome (2446666442).

The spelling of 1204152421 in words is "one billion, two hundred four million, one hundred fifty-two thousand, four hundred twenty-one".