42215401 has 4 divisors (see below), whose sum is σ = 43011972. Its totient is φ = 41418832.

The previous prime is 42215357. The next prime is 42215413. The reversal of 42215401 is 10451224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15960025 + 26255376 = 3995^2 + 5124^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215401 - 2¹⁵ = 42182633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42215431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398206 + ... + 398311.

It is an arithmetic number, because the mean of its divisors is an integer number (10752993).

Almost surely, 2^42215401 is an apocalyptic number.

It is an amenable number.

42215401 is a deficient number, since it is larger than the sum of its proper divisors (796571).

42215401 is an equidigital number, since it uses as much as digits as its factorization.

42215401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796570.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42215401 is about 6497.3379933631. The cubic root of 42215401 is about 348.1958892948.

Adding to 42215401 its reverse (10451224), we get a palindrome (52666625).

The spelling of 42215401 in words is "forty-two million, two hundred fifteen thousand, four hundred one".