421276421 has 2 divisors, whose sum is σ = 421276422. Its totient is φ = 421276420.

The previous prime is 421276411. The next prime is 421276447. The reversal of 421276421 is 124672124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419676196 + 1600225 = 20486^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 421276421 - 2²² = 417082117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421276411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210638210 + 210638211.

It is an arithmetic number, because the mean of its divisors is an integer number (210638211).

Almost surely, 2^421276421 is an apocalyptic number.

It is an amenable number.

421276421 is a deficient number, since it is larger than the sum of its proper divisors (1).

421276421 is an equidigital number, since it uses as much as digits as its factorization.

421276421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 421276421 is about 20525.0193909774. The cubic root of 421276421 is about 749.6451186239.

The spelling of 421276421 in words is "four hundred twenty-one million, two hundred seventy-six thousand, four hundred twenty-one".