42221055 has 32 divisors (see below), whose sum is σ = 70228224. Its totient is φ = 21643776.

The previous prime is 42221051. The next prime is 42221057. The reversal of 42221055 is 55012224.

It is a happy number.

It is not a de Polignac number, because 42221055 - 2² = 42221051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42221051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42727 + ... + 43703.

It is an arithmetic number, because the mean of its divisors is an integer number (2194632).

Almost surely, 2^42221055 is an apocalyptic number.

42221055 is a deficient number, since it is larger than the sum of its proper divisors (28007169).

42221055 is a wasteful number, since it uses less digits than its factorization.

42221055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 42221055 is about 6497.7730800637. The cubic root of 42221055 is about 348.2114334772.

Adding to 42221055 its reverse (55012224), we get a palindrome (97233279).

The spelling of 42221055 in words is "forty-two million, two hundred twenty-one thousand, fifty-five".