1284217421 has 4 divisors (see below), whose sum is σ = 1291392000. Its totient is φ = 1277042844.

The previous prime is 1284217393. The next prime is 1284217427. The reversal of 1284217421 is 1247124821.

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 1284217421 - 2⁶ = 1284217357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284217427) 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, 3587021 + ... + 3587378.

It is an arithmetic number, because the mean of its divisors is an integer number (322848000).

Almost surely, 2^1284217421 is an apocalyptic number.

It is an amenable number.

1284217421 is a deficient number, since it is larger than the sum of its proper divisors (7174579).

1284217421 is an equidigital number, since it uses as much as digits as its factorization.

1284217421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174578.

The product of its digits is 7168, while the sum is 32.

The square root of 1284217421 is about 35835.9794201303. The cubic root of 1284217421 is about 1086.9582228682.

The spelling of 1284217421 in words is "one billion, two hundred eighty-four million, two hundred seventeen thousand, four hundred twenty-one".