42215031 has 24 divisors (see below), whose sum is σ = 62674560. Its totient is φ = 27370896.

The previous prime is 42215027. The next prime is 42215057. The reversal of 42215031 is 13051224.

It is not a de Polignac number, because 42215031 - 2² = 42215027 is a prime.

It is a super-2 number, since 2×42215031² = 3564217684661922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42214995 and 42215013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42215081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56446 + ... + 57188.

It is an arithmetic number, because the mean of its divisors is an integer number (2611440).

Almost surely, 2^42215031 is an apocalyptic number.

42215031 is a deficient number, since it is larger than the sum of its proper divisors (20459529).

42215031 is a wasteful number, since it uses less digits than its factorization.

42215031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42215031 is about 6497.3095201014. The cubic root of 42215031 is about 348.1948720290.

Adding to 42215031 its reverse (13051224), we get a palindrome (55266255).

The spelling of 42215031 in words is "forty-two million, two hundred fifteen thousand, thirty-one".