221896948878 has 32 divisors (see below), whose sum is σ = 537931998720. Its totient is φ = 67241499480.

The previous prime is 221896948831. The next prime is 221896948901. The reversal of 221896948878 is 878849698122.

221896948878 is a `hidden beast` number, since 2 + 2 + 1 + 89 + 69 + 488 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186781350 + ... + 186782537.

It is an arithmetic number, because the mean of its divisors is an integer number (16810374960).

Almost surely, 2^221896948878 is an apocalyptic number.

221896948878 is an abundant number, since it is smaller than the sum of its proper divisors (316035049842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221896948878 is a wasteful number, since it uses less digits than its factorization.

221896948878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373563909 (or 373563903 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 72.

The spelling of 221896948878 in words is "two hundred twenty-one billion, eight hundred ninety-six million, nine hundred forty-eight thousand, eight hundred seventy-eight".