421220351 has 4 divisors (see below), whose sum is σ = 427153104. Its totient is φ = 415287600.

The previous prime is 421220323. The next prime is 421220383. The reversal of 421220351 is 153022124.

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 421220351 - 2¹⁰ = 421219327 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 (421270351) 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, 2966270 + ... + 2966411.

It is an arithmetic number, because the mean of its divisors is an integer number (106788276).

Almost surely, 2^421220351 is an apocalyptic number.

421220351 is a deficient number, since it is larger than the sum of its proper divisors (5932753).

421220351 is an equidigital number, since it uses as much as digits as its factorization.

421220351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5932752.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 421220351 is about 20523.6534515666. The cubic root of 421220351 is about 749.6118590153.

Adding to 421220351 its reverse (153022124), we get a palindrome (574242475).

The spelling of 421220351 in words is "four hundred twenty-one million, two hundred twenty thousand, three hundred fifty-one".