42919721857 has 8 divisors (see below), whose sum is σ = 45568244736. Its totient is φ = 40284958272.

The previous prime is 42919721833. The next prime is 42919721863. The reversal of 42919721857 is 75812791924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42919721857 - 2²³ = 42911333249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42919721798 and 42919721807.

It is not an unprimeable number, because it can be changed into a prime (42919721807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3433393 + ... + 3445870.

It is an arithmetic number, because the mean of its divisors is an integer number (5696030592).

Almost surely, 2^42919721857 is an apocalyptic number.

It is an amenable number.

42919721857 is a deficient number, since it is larger than the sum of its proper divisors (2648522879).

42919721857 is a wasteful number, since it uses less digits than its factorization.

42919721857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6879647.

The product of its digits is 2540160, while the sum is 55.

The spelling of 42919721857 in words is "forty-two billion, nine hundred nineteen million, seven hundred twenty-one thousand, eight hundred fifty-seven".