42221810 has 16 divisors (see below), whose sum is σ = 78053976. Its totient is φ = 16432128.

The previous prime is 42221801. The next prime is 42221831. The reversal of 42221810 is 1812224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31730689 + 10491121 = 5633^2 + 3239^2 .

It is a super-2 number, since 2×42221810² = 3565362479352200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56687 + ... + 57426.

Almost surely, 2^42221810 is an apocalyptic number.

42221810 is a deficient number, since it is larger than the sum of its proper divisors (35832166).

42221810 is a wasteful number, since it uses less digits than its factorization.

42221810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114157.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 42221810 is about 6497.8311766312. The cubic root of 42221810 is about 348.2135090456.

The spelling of 42221810 in words is "forty-two million, two hundred twenty-one thousand, eight hundred ten".