878937021922 has 4 divisors (see below), whose sum is σ = 1318405532886. Its totient is φ = 439468510960.

The previous prime is 878937021917. The next prime is 878937022003. The reversal of 878937021922 is 229120739878.

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

It can be written as a sum of positive squares in only one way, i.e., 466080655401 + 412856366521 = 682701^2 + 642539^2 .

It is a super-2 number, since 2×878937021922² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219734255479 + ... + 219734255482.

Almost surely, 2^878937021922 is an apocalyptic number.

878937021922 is a deficient number, since it is larger than the sum of its proper divisors (439468510964).

878937021922 is a wasteful number, since it uses less digits than its factorization.

878937021922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439468510963.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 878937021922 in words is "eight hundred seventy-eight billion, nine hundred thirty-seven million, twenty-one thousand, nine hundred twenty-two".