421563668 has 12 divisors (see below), whose sum is σ = 761534592. Its totient is φ = 203982360.

The previous prime is 421563647. The next prime is 421563677. The reversal of 421563668 is 866365124.

It is a super-2 number, since 2×421563668² = 355431852355228448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699730 + ... + 1699977.

It is an arithmetic number, because the mean of its divisors is an integer number (63461216).

Almost surely, 2^421563668 is an apocalyptic number.

It is an amenable number.

421563668 is a deficient number, since it is larger than the sum of its proper divisors (339970924).

421563668 is a wasteful number, since it uses less digits than its factorization.

421563668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3399742 (or 3399740 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 421563668 is about 20532.0156828306. The cubic root of 421563668 is about 749.8154615608.

The spelling of 421563668 in words is "four hundred twenty-one million, five hundred sixty-three thousand, six hundred sixty-eight".