42127321 has 2 divisors, whose sum is σ = 42127322. Its totient is φ = 42127320.

The previous prime is 42127307. The next prime is 42127331. The reversal of 42127321 is 12372124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35046400 + 7080921 = 5920^2 + 2661^2 .

It is a cyclic number.

It is not a de Polignac number, because 42127321 - 2⁵ = 42127289 is a prime.

It is a super-2 number, since 2×42127321² = 3549422349274082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42127292 and 42127301.

It is not a weakly prime, because it can be changed into another prime (42127331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21063660 + 21063661.

It is an arithmetic number, because the mean of its divisors is an integer number (21063661).

Almost surely, 2^42127321 is an apocalyptic number.

It is an amenable number.

42127321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42127321 is an equidigital number, since it uses as much as digits as its factorization.

42127321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 42127321 is about 6490.5562935699. The cubic root of 42127321 is about 347.9535571307.

Adding to 42127321 its reverse (12372124), we get a palindrome (54499445).

The spelling of 42127321 in words is "forty-two million, one hundred twenty-seven thousand, three hundred twenty-one".