1421212421 has 4 divisors (see below), whose sum is σ = 1422193344. Its totient is φ = 1420231500.

The previous prime is 1421212409. The next prime is 1421212447. The reversal of 1421212421 is 1242121241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1242121241 = 67 ⋅18539123.

It is a cyclic number.

It is not a de Polignac number, because 1421212421 - 2¹⁰ = 1421211397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421212393 and 1421212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421212321) 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, 488285 + ... + 491186.

It is an arithmetic number, because the mean of its divisors is an integer number (355548336).

Almost surely, 2^1421212421 is an apocalyptic number.

It is an amenable number.

1421212421 is a deficient number, since it is larger than the sum of its proper divisors (980923).

1421212421 is an equidigital number, since it uses as much as digits as its factorization.

1421212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980922.

The product of its digits is 256, while the sum is 20.

The square root of 1421212421 is about 37698.9710867551. The cubic root of 1421212421 is about 1124.3106680098.

Adding to 1421212421 its reverse (1242121241), we get a palindrome (2663333662).

The spelling of 1421212421 in words is "one billion, four hundred twenty-one million, two hundred twelve thousand, four hundred twenty-one".