220000408421 has 2 divisors, whose sum is σ = 220000408422. Its totient is φ = 220000408420.

The previous prime is 220000408403. The next prime is 220000408447. The reversal of 220000408421 is 124804000022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147187322500 + 72813085921 = 383650^2 + 269839^2 .

It is a cyclic number.

It is not a de Polignac number, because 220000408421 - 2¹⁴ = 220000392037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220000408451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110000204210 + 110000204211.

It is an arithmetic number, because the mean of its divisors is an integer number (110000204211).

Almost surely, 2^220000408421 is an apocalyptic number.

It is an amenable number.

220000408421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220000408421 is an equidigital number, since it uses as much as digits as its factorization.

220000408421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 220000408421 its reverse (124804000022), we get a palindrome (344804408443).

The spelling of 220000408421 in words is "two hundred twenty billion, four hundred eight thousand, four hundred twenty-one".