1245221421 has 8 divisors (see below), whose sum is σ = 1705168224. Its totient is φ = 807711120.

The previous prime is 1245221407. The next prime is 1245221429. The reversal of 1245221421 is 1241225421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1245221421 - 2⁹ = 1245220909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1245221391 and 1245221400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245221429) 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 7 ways as a sum of consecutive naturals, for example, 5608995 + ... + 5609216.

It is an arithmetic number, because the mean of its divisors is an integer number (213146028).

Almost surely, 2^1245221421 is an apocalyptic number.

It is an amenable number.

1245221421 is a deficient number, since it is larger than the sum of its proper divisors (459946803).

1245221421 is a wasteful number, since it uses less digits than its factorization.

1245221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11218251.

The product of its digits is 1280, while the sum is 24.

The square root of 1245221421 is about 35287.6950366555. The cubic root of 1245221421 is about 1075.8429072471.

Adding to 1245221421 its reverse (1241225421), we get a palindrome (2486446842).

The spelling of 1245221421 in words is "one billion, two hundred forty-five million, two hundred twenty-one thousand, four hundred twenty-one".