421215001 has 4 divisors (see below), whose sum is σ = 445992372. Its totient is φ = 396437632.

The previous prime is 421214977. The next prime is 421215019. The reversal of 421215001 is 100512124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157477401 + 263737600 = 12549^2 + 16240^2 .

It is a cyclic number.

It is not a de Polignac number, because 421215001 - 2⁹ = 421214489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421215701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12388660 + ... + 12388693.

It is an arithmetic number, because the mean of its divisors is an integer number (111498093).

Almost surely, 2^421215001 is an apocalyptic number.

It is an amenable number.

421215001 is a deficient number, since it is larger than the sum of its proper divisors (24777371).

421215001 is a wasteful number, since it uses less digits than its factorization.

421215001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24777370.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 421215001 is about 20523.5231137346. The cubic root of 421215001 is about 749.6086853474.

Adding to 421215001 its reverse (100512124), we get a palindrome (521727125).

The spelling of 421215001 in words is "four hundred twenty-one million, two hundred fifteen thousand, one".