42221633 has 2 divisors, whose sum is σ = 42221634. Its totient is φ = 42221632.

The previous prime is 42221623. The next prime is 42221681. The reversal of 42221633 is 33612224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23107249 + 19114384 = 4807^2 + 4372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42221633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42221599 and 42221608.

It is not a weakly prime, because it can be changed into another prime (42221623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110816 + 21110817.

It is an arithmetic number, because the mean of its divisors is an integer number (21110817).

Almost surely, 2^42221633 is an apocalyptic number.

It is an amenable number.

42221633 is a deficient number, since it is larger than the sum of its proper divisors (1).

42221633 is an equidigital number, since it uses as much as digits as its factorization.

42221633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 42221633 is about 6497.8175566878. The cubic root of 42221633 is about 348.2130224576.

Adding to 42221633 its reverse (33612224), we get a palindrome (75833857).

The spelling of 42221633 in words is "forty-two million, two hundred twenty-one thousand, six hundred thirty-three".