1217030421 has 16 divisors (see below), whose sum is σ = 1629771264. Its totient is φ = 807831024.

The previous prime is 1217030393. The next prime is 1217030431. The reversal of 1217030421 is 1240307121.

It is not a de Polignac number, because 1217030421 - 2⁷ = 1217030293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217030431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1258080 + ... + 1259046.

It is an arithmetic number, because the mean of its divisors is an integer number (101860704).

Almost surely, 2^1217030421 is an apocalyptic number.

It is an amenable number.

1217030421 is a deficient number, since it is larger than the sum of its proper divisors (412740843).

1217030421 is an equidigital number, since it uses as much as digits as its factorization.

1217030421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1217030421 is about 34885.9630940583. The cubic root of 1217030421 is about 1067.6620630864.

Adding to 1217030421 its reverse (1240307121), we get a palindrome (2457337542).

The spelling of 1217030421 in words is "one billion, two hundred seventeen million, thirty thousand, four hundred twenty-one".