42221640 has 32 divisors (see below), whose sum is σ = 126665280. Its totient is φ = 11259072.

The previous prime is 42221633. The next prime is 42221681. The reversal of 42221640 is 4612224.

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, 175804 + ... + 176043.

It is an arithmetic number, because the mean of its divisors is an integer number (3958290).

Almost surely, 2^42221640 is an apocalyptic number.

42221640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42221640 is an abundant number, since it is smaller than the sum of its proper divisors (84443640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42221640 is a wasteful number, since it uses less digits than its factorization.

42221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351861 (or 351857 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 42221640 is about 6497.8180953302. The cubic root of 42221640 is about 348.2130417012.

Adding to 42221640 its reverse (4612224), we get a palindrome (46833864).

The spelling of 42221640 in words is "forty-two million, two hundred twenty-one thousand, six hundred forty".