421144521 has 16 divisors (see below), whose sum is σ = 642044928. Its totient is φ = 240541200.

The previous prime is 421144501. The next prime is 421144541. The reversal of 421144521 is 125441124.

It is an interprime number because it is at equal distance from previous prime (421144501) and next prime (421144541).

It is not a de Polignac number, because 421144521 - 2¹⁵ = 421111753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421144491 and 421144500.

It is not an unprimeable number, because it can be changed into a prime (421144501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65626 + ... + 71756.

It is an arithmetic number, because the mean of its divisors is an integer number (40127808).

Almost surely, 2^421144521 is an apocalyptic number.

It is an amenable number.

421144521 is a deficient number, since it is larger than the sum of its proper divisors (220900407).

421144521 is a wasteful number, since it uses less digits than its factorization.

421144521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9412.

The product of its digits is 1280, while the sum is 24.

The square root of 421144521 is about 20521.8059877780. The cubic root of 421144521 is about 749.5668734723.

Adding to 421144521 its reverse (125441124), we get a palindrome (546585645).

The spelling of 421144521 in words is "four hundred twenty-one million, one hundred forty-four thousand, five hundred twenty-one".