421442145 has 24 divisors (see below), whose sum is σ = 738714600. Its totient is φ = 222241536.

The previous prime is 421442137. The next prime is 421442149. The reversal of 421442145 is 541244124.

It can be written as a sum of positive squares in 4 ways, for example, as 81703521 + 339738624 = 9039^2 + 18432^2 .

It is not a de Polignac number, because 421442145 - 2³ = 421442137 is a prime.

It is a super-2 number, since 2×421442145² = 355226963164402050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421442149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48610 + ... + 56619.

It is an arithmetic number, because the mean of its divisors is an integer number (30779775).

Almost surely, 2^421442145 is an apocalyptic number.

421442145 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421442145 is a deficient number, since it is larger than the sum of its proper divisors (317272455).

421442145 is a wasteful number, since it uses less digits than its factorization.

421442145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105329 (or 105326 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 421442145 is about 20529.0561156620. The cubic root of 421442145 is about 749.7434055557.

Adding to 421442145 its reverse (541244124), we get a palindrome (962686269).

The spelling of 421442145 in words is "four hundred twenty-one million, four hundred forty-two thousand, one hundred forty-five".