42946221 has 16 divisors (see below), whose sum is σ = 60125184. Its totient is φ = 27214704.

The previous prime is 42946219. The next prime is 42946223. The reversal of 42946221 is 12264924.

It is an interprime number because it is at equal distance from previous prime (42946219) and next prime (42946223).

It is not a de Polignac number, because 42946221 - 2¹ = 42946219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42946223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9660 + ... + 13386.

It is an arithmetic number, because the mean of its divisors is an integer number (3757824).

Almost surely, 2^42946221 is an apocalyptic number.

It is an amenable number.

42946221 is a deficient number, since it is larger than the sum of its proper divisors (17178963).

42946221 is a wasteful number, since it uses less digits than its factorization.

42946221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920.

The product of its digits is 6912, while the sum is 30.

The square root of 42946221 is about 6553.3366310605. The cubic root of 42946221 is about 350.1936914301.

The spelling of 42946221 in words is "forty-two million, nine hundred forty-six thousand, two hundred twenty-one".