421605629 has 2 divisors, whose sum is σ = 421605630. Its totient is φ = 421605628.

The previous prime is 421605589. The next prime is 421605631. The reversal of 421605629 is 926506124.

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., 273009529 + 148596100 = 16523^2 + 12190^2 .

It is a cyclic number.

It is not a de Polignac number, because 421605629 - 2¹² = 421601533 is a prime.

Together with 421605631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421605659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210802814 + 210802815.

It is an arithmetic number, because the mean of its divisors is an integer number (210802815).

Almost surely, 2^421605629 is an apocalyptic number.

It is an amenable number.

421605629 is a deficient number, since it is larger than the sum of its proper divisors (1).

421605629 is an equidigital number, since it uses as much as digits as its factorization.

421605629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 421605629 is about 20533.0375005745. The cubic root of 421605629 is about 749.8403387542.

The spelling of 421605629 in words is "four hundred twenty-one million, six hundred five thousand, six hundred twenty-nine".