421405512421 has 2 divisors, whose sum is σ = 421405512422. Its totient is φ = 421405512420.

The previous prime is 421405512413. The next prime is 421405512427. The reversal of 421405512421 is 124215504124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358447677025 + 62957835396 = 598705^2 + 250914^2 .

It is a cyclic number.

It is not a de Polignac number, because 421405512421 - 2³ = 421405512413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421405512427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210702756210 + 210702756211.

It is an arithmetic number, because the mean of its divisors is an integer number (210702756211).

Almost surely, 2^421405512421 is an apocalyptic number.

It is an amenable number.

421405512421 is a deficient number, since it is larger than the sum of its proper divisors (1).

421405512421 is an equidigital number, since it uses as much as digits as its factorization.

421405512421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12800, while the sum is 31.

The spelling of 421405512421 in words is "four hundred twenty-one billion, four hundred five million, five hundred twelve thousand, four hundred twenty-one".