42022261 has 2 divisors, whose sum is σ = 42022262. Its totient is φ = 42022260.

The previous prime is 42022259. The next prime is 42022289. The reversal of 42022261 is 16222024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31427236 + 10595025 = 5606^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 42022261 - 2¹ = 42022259 is a prime.

Together with 42022259, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42022241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21011130 + 21011131.

It is an arithmetic number, because the mean of its divisors is an integer number (21011131).

Almost surely, 2^42022261 is an apocalyptic number.

It is an amenable number.

42022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42022261 is an equidigital number, since it uses as much as digits as its factorization.

42022261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 42022261 is about 6482.4579443295. The cubic root of 42022261 is about 347.6640662046.

Adding to 42022261 its reverse (16222024), we get a palindrome (58244285).

The spelling of 42022261 in words is "forty-two million, twenty-two thousand, two hundred sixty-one".