42102121 has 8 divisors (see below), whose sum is σ = 45005184. Its totient is φ = 39288480.

The previous prime is 42102107. The next prime is 42102131. The reversal of 42102121 is 12120124.

It is a happy number.

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 42102121 - 2⁵ = 42102089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42102131) 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, 21381 + ... + 23266.

It is an arithmetic number, because the mean of its divisors is an integer number (5625648).

Almost surely, 2^42102121 is an apocalyptic number.

42102121 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42102121 is a deficient number, since it is larger than the sum of its proper divisors (2903063).

42102121 is a wasteful number, since it uses less digits than its factorization.

42102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44711.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 42102121 is about 6488.6147211866. The cubic root of 42102121 is about 347.8841629038.

Adding to 42102121 its reverse (12120124), we get a palindrome (54222245).

The spelling of 42102121 in words is "forty-two million, one hundred two thousand, one hundred twenty-one".