42121201 has 4 divisors (see below), whose sum is σ = 42452992. Its totient is φ = 41789412.

The previous prime is 42121193. The next prime is 42121217. The reversal of 42121201 is 10212124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42121201 - 2³ = 42121193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42121231) 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, 165705 + ... + 165958.

It is an arithmetic number, because the mean of its divisors is an integer number (10613248).

Almost surely, 2^42121201 is an apocalyptic number.

It is an amenable number.

42121201 is a deficient number, since it is larger than the sum of its proper divisors (331791).

42121201 is a wasteful number, since it uses less digits than its factorization.

42121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331790.

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

The square root of 42121201 is about 6490.0848222500. The cubic root of 42121201 is about 347.9367067918.

Adding to 42121201 its reverse (10212124), we get a palindrome (52333325).

The spelling of 42121201 in words is "forty-two million, one hundred twenty-one thousand, two hundred one".