42420101 has 4 divisors (see below), whose sum is σ = 42840204. Its totient is φ = 42000000.

The previous prime is 42420067. The next prime is 42420109. The reversal of 42420101 is 10102424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36784225 + 5635876 = 6065^2 + 2374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42420101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209900 + ... + 210101.

It is an arithmetic number, because the mean of its divisors is an integer number (10710051).

Almost surely, 2^42420101 is an apocalyptic number.

It is an amenable number.

42420101 is a deficient number, since it is larger than the sum of its proper divisors (420103).

42420101 is a wasteful number, since it uses less digits than its factorization.

42420101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420102.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 42420101 is about 6513.0715488163. The cubic root of 42420101 is about 348.7577758915.

Adding to 42420101 its reverse (10102424), we get a palindrome (52522525).

The spelling of 42420101 in words is "forty-two million, four hundred twenty thousand, one hundred one".