1421212321 has 2 divisors, whose sum is σ = 1421212322. Its totient is φ = 1421212320.

The previous prime is 1421212301. The next prime is 1421212327. The reversal of 1421212321 is 1232121241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1293409296 + 127803025 = 35964^2 + 11305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421212321 - 2²¹ = 1419115169 is a prime.

It is a super-2 number, since 2×1421212321² = 4039688922724414082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1421212327) 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 as a sum of consecutive naturals, namely, 710606160 + 710606161.

It is an arithmetic number, because the mean of its divisors is an integer number (710606161).

Almost surely, 2^1421212321 is an apocalyptic number.

It is an amenable number.

1421212321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421212321 is an equidigital number, since it uses as much as digits as its factorization.

1421212321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 1421212321 is about 37698.9697604590. The cubic root of 1421212321 is about 1124.3106416401.

Adding to 1421212321 its reverse (1232121241), we get a palindrome (2653333562).

The spelling of 1421212321 in words is "one billion, four hundred twenty-one million, two hundred twelve thousand, three hundred twenty-one".