1205214421 has 16 divisors (see below), whose sum is σ = 1279438848. Its totient is φ = 1132916400.

The previous prime is 1205214407. The next prime is 1205214443. The reversal of 1205214421 is 1244125021.

It is a cyclic number.

It is not a de Polignac number, because 1205214421 - 2⁵ = 1205214389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205214392 and 1205214401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205214121) 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, 598306 + ... + 600316.

It is an arithmetic number, because the mean of its divisors is an integer number (79964928).

Almost surely, 2^1205214421 is an apocalyptic number.

It is an amenable number.

1205214421 is a deficient number, since it is larger than the sum of its proper divisors (74224427).

1205214421 is a wasteful number, since it uses less digits than its factorization.

1205214421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472.

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

The square root of 1205214421 is about 34716.1982509606. The cubic root of 1205214421 is about 1064.1955531825.

Adding to 1205214421 its reverse (1244125021), we get a palindrome (2449339442).

The spelling of 1205214421 in words is "one billion, two hundred five million, two hundred fourteen thousand, four hundred twenty-one".