42420212 has 12 divisors (see below), whose sum is σ = 74458020. Its totient is φ = 21146496.

The previous prime is 42420181. The next prime is 42420223. The reversal of 42420212 is 21202424.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15649936 + 26770276 = 3956^2 + 5174^2 .

It is a super-2 number, since 2×42420212² = 3598948772249888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14387 + ... + 17082.

It is an arithmetic number, because the mean of its divisors is an integer number (6204835).

Almost surely, 2^42420212 is an apocalyptic number.

It is an amenable number.

42420212 is a deficient number, since it is larger than the sum of its proper divisors (32037808).

42420212 is a wasteful number, since it uses less digits than its factorization.

42420212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31810 (or 31808 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42420212 is about 6513.0800701358. The cubic root of 42420212 is about 348.7580800875.

Adding to 42420212 its reverse (21202424), we get a palindrome (63622636).

The spelling of 42420212 in words is "forty-two million, four hundred twenty thousand, two hundred twelve".