42156055521 has 6 divisors (see below), whose sum is σ = 60892080210. Its totient is φ = 28104037008.

The previous prime is 42156055519. The next prime is 42156055537. The reversal of 42156055521 is 12555065124.

42156055521 is a `hidden beast` number, since 4 + 21 + 5 + 60 + 55 + 521 = 666.

42156055521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 30758144400 + 11397911121 = 175380^2 + 106761^2 .

It is not a de Polignac number, because 42156055521 - 2¹ = 42156055519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42156055021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2342003076 + ... + 2342003093.

It is an arithmetic number, because the mean of its divisors is an integer number (10148680035).

Almost surely, 2^42156055521 is an apocalyptic number.

It is an amenable number.

42156055521 is a deficient number, since it is larger than the sum of its proper divisors (18736024689).

42156055521 is a wasteful number, since it uses less digits than its factorization.

42156055521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684006175 (or 4684006172 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 42156055521 in words is "forty-two billion, one hundred fifty-six million, fifty-five thousand, five hundred twenty-one".