421256501 has 8 divisors (see below), whose sum is σ = 427388184. Its totient is φ = 415134720.

The previous prime is 421256483. The next prime is 421256527. The reversal of 421256501 is 105652124.

It can be written as a sum of positive squares in 4 ways, for example, as 153115876 + 268140625 = 12374^2 + 16375^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421256501 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 (421226501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145811 + ... + 148671.

It is an arithmetic number, because the mean of its divisors is an integer number (53423523).

Almost surely, 2^421256501 is an apocalyptic number.

It is an amenable number.

421256501 is a deficient number, since it is larger than the sum of its proper divisors (6131683).

421256501 is a wasteful number, since it uses less digits than its factorization.

421256501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 421256501 is about 20524.5341238236. The cubic root of 421256501 is about 749.6333028142.

The spelling of 421256501 in words is "four hundred twenty-one million, two hundred fifty-six thousand, five hundred one".