42120001 has 16 divisors (see below), whose sum is σ = 53509248. Its totient is φ = 32198400.

The previous prime is 42119993. The next prime is 42120007. The reversal of 42120001 is 10002124.

It is a cyclic number.

It is not a de Polignac number, because 42120001 - 2³ = 42119993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42120001.

It is not an unprimeable number, because it can be changed into a prime (42120007) 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, 1080 + ... + 9241.

It is an arithmetic number, because the mean of its divisors is an integer number (3344328).

Almost surely, 2^42120001 is an apocalyptic number.

It is an amenable number.

42120001 is a deficient number, since it is larger than the sum of its proper divisors (11389247).

42120001 is a wasteful number, since it uses less digits than its factorization.

42120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10392.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 42120001 is about 6489.9923728769. The cubic root of 42120001 is about 347.9334026124.

Adding to 42120001 its reverse (10002124), we get a palindrome (52122125).

The spelling of 42120001 in words is "forty-two million, one hundred twenty thousand, one".