42450121 has 6 divisors (see below), whose sum is σ = 49380810. Its totient is φ = 36385776.

The previous prime is 42450077. The next prime is 42450127. The reversal of 42450121 is 12105424.

It can be written as a sum of positive squares in only one way, i.e., 41744521 + 705600 = 6461^2 + 840^2 .

It is not a de Polignac number, because 42450121 - 2⁹ = 42449609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42450127) 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, 433116 + ... + 433213.

It is an arithmetic number, because the mean of its divisors is an integer number (8230135).

Almost surely, 2^42450121 is an apocalyptic number.

It is an amenable number.

42450121 is a deficient number, since it is larger than the sum of its proper divisors (6930689).

42450121 is an equidigital number, since it uses as much as digits as its factorization.

42450121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866343 (or 866336 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42450121 is about 6515.3757374383. The cubic root of 42450121 is about 348.8400265181.

Adding to 42450121 its reverse (12105424), we get a palindrome (54555545).

The spelling of 42450121 in words is "forty-two million, four hundred fifty thousand, one hundred twenty-one".