421021105 has 16 divisors (see below), whose sum is σ = 510008400. Its totient is φ = 333641728.

The previous prime is 421021103. The next prime is 421021121. The reversal of 421021105 is 501120124.

It can be written as a sum of positive squares in 8 ways, for example, as 30603024 + 390418081 = 5532^2 + 19759^2 .

It is a cyclic number.

It is not a de Polignac number, because 421021105 - 2¹ = 421021103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421021103) 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, 441309 + ... + 442261.

It is an arithmetic number, because the mean of its divisors is an integer number (31875525).

Almost surely, 2^421021105 is an apocalyptic number.

It is an amenable number.

421021105 is a deficient number, since it is larger than the sum of its proper divisors (88987295).

421021105 is a wasteful number, since it uses less digits than its factorization.

421021105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 421021105 is about 20518.7988196190. The cubic root of 421021105 is about 749.4936463664.

Adding to 421021105 its reverse (501120124), we get a palindrome (922141229).

The spelling of 421021105 in words is "four hundred twenty-one million, twenty-one thousand, one hundred five".