1205124421 has 4 divisors (see below), whose sum is σ = 1207540000. Its totient is φ = 1202708844.

The previous prime is 1205124409. The next prime is 1205124449. The reversal of 1205124421 is 1244215021.

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 1205124421 - 2¹³ = 1205116229 is a prime.

It is a super-3 number, since 3×1205124421³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205124392 and 1205124401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205124461) 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 3 ways as a sum of consecutive naturals, for example, 1207041 + ... + 1208038.

It is an arithmetic number, because the mean of its divisors is an integer number (301885000).

Almost surely, 2^1205124421 is an apocalyptic number.

It is an amenable number.

1205124421 is a deficient number, since it is larger than the sum of its proper divisors (2415579).

1205124421 is an equidigital number, since it uses as much as digits as its factorization.

1205124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415578.

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

The square root of 1205124421 is about 34714.9020018781. The cubic root of 1205124421 is about 1064.1690627417.

Adding to 1205124421 its reverse (1244215021), we get a palindrome (2449339442).

The spelling of 1205124421 in words is "one billion, two hundred five million, one hundred twenty-four thousand, four hundred twenty-one".