421007621 has 8 divisors (see below), whose sum is σ = 434860800. Its totient is φ = 407171520.

The previous prime is 421007611. The next prime is 421007627. The reversal of 421007621 is 126700124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421007621 - 2¹⁸ = 420745477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421007627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62810 + ... + 69188.

It is an arithmetic number, because the mean of its divisors is an integer number (54357600).

Almost surely, 2^421007621 is an apocalyptic number.

It is an amenable number.

421007621 is a deficient number, since it is larger than the sum of its proper divisors (13853179).

421007621 is a wasteful number, since it uses less digits than its factorization.

421007621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8539.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 421007621 is about 20518.4702402494. The cubic root of 421007621 is about 749.4856449621.

Adding to 421007621 its reverse (126700124), we get a palindrome (547707745).

The spelling of 421007621 in words is "four hundred twenty-one million, seven thousand, six hundred twenty-one".