421198751 has 4 divisors (see below), whose sum is σ = 421272600. Its totient is φ = 421124904.

The previous prime is 421198733. The next prime is 421198753. The reversal of 421198751 is 157891124.

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

It is a cyclic number.

It is not a de Polignac number, because 421198751 - 2²² = 417004447 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 (421198753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27581 + ... + 40038.

It is an arithmetic number, because the mean of its divisors is an integer number (105318150).

Almost surely, 2^421198751 is an apocalyptic number.

421198751 is a deficient number, since it is larger than the sum of its proper divisors (73849).

421198751 is an equidigital number, since it uses as much as digits as its factorization.

421198751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73848.

The product of its digits is 20160, while the sum is 38.

The square root of 421198751 is about 20523.1272227212. The cubic root of 421198751 is about 749.5990455374.

The spelling of 421198751 in words is "four hundred twenty-one million, one hundred ninety-eight thousand, seven hundred fifty-one".