221099967 has 24 divisors (see below), whose sum is σ = 359643648. Its totient is φ = 129675600.

The previous prime is 221099959. The next prime is 221099987. The reversal of 221099967 is 769990122.

It is not a de Polignac number, because 221099967 - 2³ = 221099959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221099917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32953 + ... + 39090.

It is an arithmetic number, because the mean of its divisors is an integer number (14985152).

Almost surely, 2^221099967 is an apocalyptic number.

221099967 is a deficient number, since it is larger than the sum of its proper divisors (138543681).

221099967 is a wasteful number, since it uses less digits than its factorization.

221099967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72091 (or 72088 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 221099967 is about 14869.4306212444. The cubic root of 221099967 is about 604.6855064694.

The spelling of 221099967 in words is "two hundred twenty-one million, ninety-nine thousand, nine hundred sixty-seven".