421100251 has 32 divisors (see below), whose sum is σ = 530385408. Its totient is φ = 328419840.

The previous prime is 421100233. The next prime is 421100269. The reversal of 421100251 is 152001124.

It is an interprime number because it is at equal distance from previous prime (421100233) and next prime (421100269).

It is a cyclic number.

It is not a de Polignac number, because 421100251 - 2⁹ = 421099739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421100221) 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 31 ways as a sum of consecutive naturals, for example, 200730 + ... + 202816.

It is an arithmetic number, because the mean of its divisors is an integer number (16574544).

Almost surely, 2^421100251 is an apocalyptic number.

421100251 is a deficient number, since it is larger than the sum of its proper divisors (109285157).

421100251 is a wasteful number, since it uses less digits than its factorization.

421100251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

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

The square root of 421100251 is about 20520.7273506569. The cubic root of 421100251 is about 749.5406081511.

Adding to 421100251 its reverse (152001124), we get a palindrome (573101375).

The spelling of 421100251 in words is "four hundred twenty-one million, one hundred thousand, two hundred fifty-one".