421221011 has 6 divisors (see below), whose sum is σ = 440331780. Its totient is φ = 402906548.

The previous prime is 421221007. The next prime is 421221029. The reversal of 421221011 is 110122124.

It is a happy number.

It is not a de Polignac number, because 421221011 - 2² = 421221007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421221071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 397601 + ... + 398658.

It is an arithmetic number, because the mean of its divisors is an integer number (73388630).

Almost surely, 2^421221011 is an apocalyptic number.

421221011 is a deficient number, since it is larger than the sum of its proper divisors (19110769).

421221011 is an equidigital number, since it uses as much as digits as its factorization.

421221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796305 (or 796282 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 421221011 is about 20523.6695305688. The cubic root of 421221011 is about 749.6122505313.

Adding to 421221011 its reverse (110122124), we get a palindrome (531343135).

The spelling of 421221011 in words is "four hundred twenty-one million, two hundred twenty-one thousand, eleven".