421021101 has 16 divisors (see below), whose sum is σ = 583349760. Its totient is φ = 269774400.

The previous prime is 421021093. The next prime is 421021103. The reversal of 421021101 is 101120124.

It is a happy number.

It is not a de Polignac number, because 421021101 - 2³ = 421021093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8551 + ... + 30251.

It is an arithmetic number, because the mean of its divisors is an integer number (36459360).

Almost surely, 2^421021101 is an apocalyptic number.

It is an amenable number.

421021101 is a deficient number, since it is larger than the sum of its proper divisors (162328659).

421021101 is a wasteful number, since it uses less digits than its factorization.

421021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21956.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 421021101 is about 20518.7987221475. The cubic root of 421021101 is about 749.4936439928.

Adding to 421021101 its reverse (101120124), we get a palindrome (522141225).

The spelling of 421021101 in words is "four hundred twenty-one million, twenty-one thousand, one hundred one".