421242105 has 16 divisors (see below), whose sum is σ = 695729664. Its totient is φ = 217415040.

The previous prime is 421242091. The next prime is 421242131. The reversal of 421242105 is 501242124.

It is not a de Polignac number, because 421242105 - 2⁹ = 421241593 is a prime.

It is a super-2 number, since 2×421242105² = 354889822049662050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452484 + ... + 453413.

It is an arithmetic number, because the mean of its divisors is an integer number (43483104).

Almost surely, 2^421242105 is an apocalyptic number.

It is an amenable number.

421242105 is a deficient number, since it is larger than the sum of its proper divisors (274487559).

421242105 is a wasteful number, since it uses less digits than its factorization.

421242105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905936.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 421242105 is about 20524.1834185918. The cubic root of 421242105 is about 749.6247634058.

Adding to 421242105 its reverse (501242124), we get a palindrome (922484229).

The spelling of 421242105 in words is "four hundred twenty-one million, two hundred forty-two thousand, one hundred five".