42919721855 has 4 divisors (see below), whose sum is σ = 51503666232. Its totient is φ = 34335777480.

The previous prime is 42919721833. The next prime is 42919721863. The reversal of 42919721855 is 55812791924.

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

It is not a de Polignac number, because 42919721855 - 2¹⁴ = 42919705471 is a prime.

It is a super-2 number, since 2×42919721855² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42919721797 and 42919721806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4291972181 + ... + 4291972190.

It is an arithmetic number, because the mean of its divisors is an integer number (12875916558).

Almost surely, 2^42919721855 is an apocalyptic number.

42919721855 is a deficient number, since it is larger than the sum of its proper divisors (8583944377).

42919721855 is an equidigital number, since it uses as much as digits as its factorization.

42919721855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8583944376.

The product of its digits is 1814400, while the sum is 53.

The spelling of 42919721855 in words is "forty-two billion, nine hundred nineteen million, seven hundred twenty-one thousand, eight hundred fifty-five".