42102145 has 8 divisors (see below), whose sum is σ = 50815656. Its totient is φ = 33486336.

The previous prime is 42102143. The next prime is 42102161. The reversal of 42102145 is 54120124.

It can be written as a sum of positive squares in 4 ways, for example, as 2563201 + 39538944 = 1601^2 + 6288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42102145 - 2¹ = 42102143 is a prime.

It is a super-2 number, since 2×42102145² = 3545181227202050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42102143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23472 + ... + 25201.

It is an arithmetic number, because the mean of its divisors is an integer number (6351957).

Almost surely, 2^42102145 is an apocalyptic number.

It is an amenable number.

42102145 is a deficient number, since it is larger than the sum of its proper divisors (8713511).

42102145 is a wasteful number, since it uses less digits than its factorization.

42102145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48851.

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

The square root of 42102145 is about 6488.6165705796. The cubic root of 42102145 is about 347.8842290067.

Adding to 42102145 its reverse (54120124), we get a palindrome (96222269).

The spelling of 42102145 in words is "forty-two million, one hundred two thousand, one hundred forty-five".