431221011 has 16 divisors (see below), whose sum is σ = 622778016. Its totient is φ = 263828736.

The previous prime is 431220991. The next prime is 431221013. The reversal of 431221011 is 110122134.

It is not a de Polignac number, because 431221011 - 2¹³ = 431212819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (431221013) 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, 25210 + ... + 38703.

It is an arithmetic number, because the mean of its divisors is an integer number (38923626).

Almost surely, 2^431221011 is an apocalyptic number.

431221011 is a deficient number, since it is larger than the sum of its proper divisors (191557005).

431221011 is a wasteful number, since it uses less digits than its factorization.

431221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64102.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 431221011 is about 20765.8616724662. The cubic root of 431221011 is about 755.4979747697.

Adding to 431221011 its reverse (110122134), we get a palindrome (541343145).

The spelling of 431221011 in words is "four hundred thirty-one million, two hundred twenty-one thousand, eleven".