42160421 has 2 divisors, whose sum is σ = 42160422. Its totient is φ = 42160420.

The previous prime is 42160409. The next prime is 42160429. The reversal of 42160421 is 12406124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 4202500 = 6161^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42160421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42160393 and 42160402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42160429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21080210 + 21080211.

It is an arithmetic number, because the mean of its divisors is an integer number (21080211).

Almost surely, 2^42160421 is an apocalyptic number.

It is an amenable number.

42160421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42160421 is an equidigital number, since it uses as much as digits as its factorization.

42160421 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 20.

The square root of 42160421 is about 6493.1056513813. The cubic root of 42160421 is about 348.0446638627.

Adding to 42160421 its reverse (12406124), we get a palindrome (54566545).

The spelling of 42160421 in words is "forty-two million, one hundred sixty thousand, four hundred twenty-one".