42621331 has 2 divisors, whose sum is σ = 42621332. Its totient is φ = 42621330.

The previous prime is 42621317. The next prime is 42621343. The reversal of 42621331 is 13312624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42621331 - 2²¹ = 40524179 is a prime.

It is a super-2 number, since 2×42621331² = 3633155712423122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42621391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21310665 + 21310666.

It is an arithmetic number, because the mean of its divisors is an integer number (21310666).

Almost surely, 2^42621331 is an apocalyptic number.

42621331 is a deficient number, since it is larger than the sum of its proper divisors (1).

42621331 is an equidigital number, since it uses as much as digits as its factorization.

42621331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 42621331 is about 6528.5014360112. The cubic root of 42621331 is about 349.3083784311.

Adding to 42621331 its reverse (13312624), we get a palindrome (55933955).

The spelling of 42621331 in words is "forty-two million, six hundred twenty-one thousand, three hundred thirty-one".