421250021 has 8 divisors (see below), whose sum is σ = 446394240. Its totient is φ = 396146368.

The previous prime is 421250017. The next prime is 421250033. The reversal of 421250021 is 120052124.

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 421250021 - 2² = 421250017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421250051) 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, 12740 + ... + 31698.

It is an arithmetic number, because the mean of its divisors is an integer number (55799280).

Almost surely, 2^421250021 is an apocalyptic number.

It is an amenable number.

421250021 is a deficient number, since it is larger than the sum of its proper divisors (25144219).

421250021 is a wasteful number, since it uses less digits than its factorization.

421250021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20283.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 421250021 is about 20524.3762633606. The cubic root of 421250021 is about 749.6294590367.

The spelling of 421250021 in words is "four hundred twenty-one million, two hundred fifty thousand, twenty-one".