42521101 has 16 divisors (see below), whose sum is σ = 49547520. Its totient is φ = 35740800.

The previous prime is 42521077. The next prime is 42521111. The reversal of 42521101 is 10112524.

It is a cyclic number.

It is not a de Polignac number, because 42521101 - 2⁹ = 42520589 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 (42521111) 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, 96640 + ... + 97078.

It is an arithmetic number, because the mean of its divisors is an integer number (3096720).

Almost surely, 2^42521101 is an apocalyptic number.

It is an amenable number.

42521101 is a deficient number, since it is larger than the sum of its proper divisors (7026419).

42521101 is a wasteful number, since it uses less digits than its factorization.

42521101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

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

The square root of 42521101 is about 6520.8205771973. The cubic root of 42521101 is about 349.0343477332.

Adding to 42521101 its reverse (10112524), we get a palindrome (52633625).

The spelling of 42521101 in words is "forty-two million, five hundred twenty-one thousand, one hundred one".