42202621 has 2 divisors, whose sum is σ = 42202622. Its totient is φ = 42202620.

The previous prime is 42202609. The next prime is 42202649. The reversal of 42202621 is 12620224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32832900 + 9369721 = 5730^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 42202621 - 2²¹ = 40105469 is a prime.

It is a super-2 number, since 2×42202621² = 3562122438539282, 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 (42202661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21101310 + 21101311.

It is an arithmetic number, because the mean of its divisors is an integer number (21101311).

Almost surely, 2^42202621 is an apocalyptic number.

It is an amenable number.

42202621 is a deficient number, since it is larger than the sum of its proper divisors (1).

42202621 is an equidigital number, since it uses as much as digits as its factorization.

42202621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42202621 is about 6496.3544392220. The cubic root of 42202621 is about 348.1607489394.

Adding to 42202621 its reverse (12620224), we get a palindrome (54822845).

The spelling of 42202621 in words is "forty-two million, two hundred two thousand, six hundred twenty-one".