6614221421 has 2 divisors, whose sum is σ = 6614221422. Its totient is φ = 6614221420.

The previous prime is 6614221409. The next prime is 6614221459. The reversal of 6614221421 is 1241224166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5854392196 + 759829225 = 76514^2 + 27565^2 .

It is a cyclic number.

It is not a de Polignac number, because 6614221421 - 2⁶ = 6614221357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6614229421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3307110710 + 3307110711.

It is an arithmetic number, because the mean of its divisors is an integer number (3307110711).

Almost surely, 2^6614221421 is an apocalyptic number.

It is an amenable number.

6614221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6614221421 is an equidigital number, since it uses as much as digits as its factorization.

6614221421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The square root of 6614221421 is about 81327.8637430002. The cubic root of 6614221421 is about 1877.1237727158.

Adding to 6614221421 its reverse (1241224166), we get a palindrome (7855445587).

The spelling of 6614221421 in words is "six billion, six hundred fourteen million, two hundred twenty-one thousand, four hundred twenty-one".