221493611916 has 60 divisors (see below), whose sum is σ = 579179196288. Its totient is φ = 73811932128.

The previous prime is 221493611879. The next prime is 221493611917. The reversal of 221493611916 is 619116394122.

221493611916 is a `hidden beast` number, since 2 + 2 + 14 + 9 + 3 + 611 + 9 + 16 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (221493611917) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1181845 + ... + 1356371.

Almost surely, 2^221493611916 is an apocalyptic number.

It is an amenable number.

221493611916 is an abundant number, since it is smaller than the sum of its proper divisors (357685584372).

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

221493611916 is a wasteful number, since it uses less digits than its factorization.

221493611916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178460 (or 178449 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 221493611916 in words is "two hundred twenty-one billion, four hundred ninety-three million, six hundred eleven thousand, nine hundred sixteen".