421663305 has 16 divisors (see below), whose sum is σ = 771041664. Its totient is φ = 192760320.

The previous prime is 421663303. The next prime is 421663309. The reversal of 421663305 is 503366124.

It is not a de Polignac number, because 421663305 - 2¹ = 421663303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421663303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2007816 + ... + 2008025.

It is an arithmetic number, because the mean of its divisors is an integer number (48190104).

Almost surely, 2^421663305 is an apocalyptic number.

It is an amenable number.

421663305 is a deficient number, since it is larger than the sum of its proper divisors (349378359).

421663305 is a wasteful number, since it uses less digits than its factorization.

421663305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015856.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 421663305 is about 20534.4419208314. The cubic root of 421663305 is about 749.8745301220.

The spelling of 421663305 in words is "four hundred twenty-one million, six hundred sixty-three thousand, three hundred five".