42157679121 has 16 divisors (see below), whose sum is σ = 64143817600. Its totient is φ = 27345520944.

The previous prime is 42157679119. The next prime is 42157679129. The reversal of 42157679121 is 12197675124.

42157679121 is a `hidden beast` number, since 4 + 2 + 1 + 576 + 79 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 42157679121 - 2¹ = 42157679119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42157679129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21098941 + ... + 21100938.

It is an arithmetic number, because the mean of its divisors is an integer number (4008988600).

Almost surely, 2^42157679121 is an apocalyptic number.

It is an amenable number.

42157679121 is a deficient number, since it is larger than the sum of its proper divisors (21986138479).

42157679121 is a wasteful number, since it uses less digits than its factorization.

42157679121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42199925 (or 42199919 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The spelling of 42157679121 in words is "forty-two billion, one hundred fifty-seven million, six hundred seventy-nine thousand, one hundred twenty-one".