431445021 has 8 divisors (see below), whose sum is σ = 657440064. Its totient is φ = 246540000.

The previous prime is 431444987. The next prime is 431445029. The reversal of 431445021 is 120544134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 431445021 - 2¹⁰ = 431443997 is a prime.

It is a super-2 number, since 2×431445021² = 372289612291380882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 431444982 and 431445000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431445029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10272480 + ... + 10272521.

It is an arithmetic number, because the mean of its divisors is an integer number (82180008).

Almost surely, 2^431445021 is an apocalyptic number.

It is an amenable number.

431445021 is a deficient number, since it is larger than the sum of its proper divisors (225995043).

431445021 is a wasteful number, since it uses less digits than its factorization.

431445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545011.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 431445021 is about 20771.2546804472. The cubic root of 431445021 is about 755.6287737492.

Adding to 431445021 its reverse (120544134), we get a palindrome (551989155).

The spelling of 431445021 in words is "four hundred thirty-one million, four hundred forty-five thousand, twenty-one".