42611221 has 2 divisors, whose sum is σ = 42611222. Its totient is φ = 42611220.

The previous prime is 42611209. The next prime is 42611251. The reversal of 42611221 is 12211624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42107121 + 504100 = 6489^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 42611221 - 2⁵ = 42611189 is a prime.

It is a super-2 number, since 2×42611221² = 3631432310221682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42611251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21305610 + 21305611.

It is an arithmetic number, because the mean of its divisors is an integer number (21305611).

Almost surely, 2^42611221 is an apocalyptic number.

It is an amenable number.

42611221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42611221 is an equidigital number, since it uses as much as digits as its factorization.

42611221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 42611221 is about 6527.7270929474. The cubic root of 42611221 is about 349.2807569960.

Adding to 42611221 its reverse (12211624), we get a palindrome (54822845).

The spelling of 42611221 in words is "forty-two million, six hundred eleven thousand, two hundred twenty-one".