284020421 has 2 divisors, whose sum is σ = 284020422. Its totient is φ = 284020420.

The previous prime is 284020397. The next prime is 284020441. The reversal of 284020421 is 124020482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253924225 + 30096196 = 15935^2 + 5486^2 .

It is a cyclic number.

It is not a de Polignac number, because 284020421 - 2¹⁴ = 284004037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (284020441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142010210 + 142010211.

It is an arithmetic number, because the mean of its divisors is an integer number (142010211).

Almost surely, 2^284020421 is an apocalyptic number.

It is an amenable number.

284020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

284020421 is an equidigital number, since it uses as much as digits as its factorization.

284020421 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.

The square root of 284020421 is about 16852.9054171677. The cubic root of 284020421 is about 657.3295994686.

The spelling of 284020421 in words is "two hundred eighty-four million, twenty thousand, four hundred twenty-one".