42221672 has 8 divisors (see below), whose sum is σ = 79165650. Its totient is φ = 21110832.

The previous prime is 42221633. The next prime is 42221681. The reversal of 42221672 is 27612224.

It can be written as a sum of positive squares in only one way, i.e., 33016516 + 9205156 = 5746^2 + 3034^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638847 + ... + 2638862.

Almost surely, 2^42221672 is an apocalyptic number.

It is an amenable number.

42221672 is a deficient number, since it is larger than the sum of its proper divisors (36943978).

42221672 is a wasteful number, since it uses less digits than its factorization.

42221672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277715 (or 5277711 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 42221672 is about 6497.8205576947. The cubic root of 42221672 is about 348.2131296720.

Adding to 42221672 its reverse (27612224), we get a palindrome (69833896).

The spelling of 42221672 in words is "forty-two million, two hundred twenty-one thousand, six hundred seventy-two".