42155335335221 has 4 divisors (see below), whose sum is σ = 42156291521100. Its totient is φ = 42154379149344.

The previous prime is 42155335335137. The next prime is 42155335335259. The reversal of 42155335335221 is 12253353355124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34704045948196 + 7451289387025 = 5891014^2 + 2729705^2 .

It is a cyclic number.

It is not a de Polignac number, because 42155335335221 - 2²² = 42155331140917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42155335332221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478026806 + ... + 478114983.

It is an arithmetic number, because the mean of its divisors is an integer number (10539072880275).

Almost surely, 2^{42155335335221} is an apocalyptic number.

It is an amenable number.

42155335335221 is a deficient number, since it is larger than the sum of its proper divisors (956185879).

42155335335221 is an equidigital number, since it uses as much as digits as its factorization.

42155335335221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956185878.

The product of its digits is 1620000, while the sum is 44.

The spelling of 42155335335221 in words is "forty-two trillion, one hundred fifty-five billion, three hundred thirty-five million, three hundred thirty-five thousand, two hundred twenty-one".