42121211 has 8 divisors (see below), whose sum is σ = 47948544. Its totient is φ = 36626920.

The previous prime is 42121193. The next prime is 42121217. The reversal of 42121211 is 11212124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42121211 - 2⁶ = 42121147 is a prime.

It is a super-2 number, since 2×42121211² = 3548392832213042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42121217) 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, 82991 + ... + 83496.

It is an arithmetic number, because the mean of its divisors is an integer number (5993568).

Almost surely, 2^42121211 is an apocalyptic number.

42121211 is a deficient number, since it is larger than the sum of its proper divisors (5827333).

42121211 is a wasteful number, since it uses less digits than its factorization.

42121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166521.

The product of its digits is 32, while the sum is 14.

The square root of 42121211 is about 6490.0855926559. The cubic root of 42121211 is about 347.9367343264.

Adding to 42121211 its reverse (11212124), we get a palindrome (53333335).

The spelling of 42121211 in words is "forty-two million, one hundred twenty-one thousand, two hundred eleven".