42100356221 has 16 divisors (see below), whose sum is σ = 52752537600. Its totient is φ = 32640608880.

The previous prime is 42100356169. The next prime is 42100356223. The reversal of 42100356221 is 12265300124.

It is a happy number.

It is not a de Polignac number, because 42100356221 - 2¹⁰ = 42100355197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42100356223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1358441 + ... + 1389086.

It is an arithmetic number, because the mean of its divisors is an integer number (3297033600).

Almost surely, 2^42100356221 is an apocalyptic number.

It is an amenable number.

42100356221 is a deficient number, since it is larger than the sum of its proper divisors (10652181379).

42100356221 is a wasteful number, since it uses less digits than its factorization.

42100356221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747744.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 42100356221 its reverse (12265300124), we get a palindrome (54365656345).

The spelling of 42100356221 in words is "forty-two billion, one hundred million, three hundred fifty-six thousand, two hundred twenty-one".