42021015 has 8 divisors (see below), whose sum is σ = 67233648. Its totient is φ = 22411200.

The previous prime is 42020983. The next prime is 42021017. The reversal of 42021015 is 51012024.

42021015 = 2897² + 2898² + ... + 2901².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42021015 - 2⁵ = 42020983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 2801401 = 42021015 / (4 + 2 + 0 + 2 + 1 + 0 + 1 + 5).

It is a junction number, because it is equal to n+sod(n) for n = 42020985 and 42021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1400686 + ... + 1400715.

It is an arithmetic number, because the mean of its divisors is an integer number (8404206).

Almost surely, 2^42021015 is an apocalyptic number.

42021015 is a deficient number, since it is larger than the sum of its proper divisors (25212633).

42021015 is a wasteful number, since it uses less digits than its factorization.

42021015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801409.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 42021015 is about 6482.3618380957. The cubic root of 42021015 is about 347.6606299806.

Adding to 42021015 its reverse (51012024), we get a palindrome (93033039).

The spelling of 42021015 in words is "forty-two million, twenty-one thousand, fifteen".