221195381 has 24 divisors (see below), whose sum is σ = 259241472. Its totient is φ = 187932800.

The previous prime is 221195371. The next prime is 221195407. The reversal of 221195381 is 183591122.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-221195381 is a prime.

It is a super-2 number, since 2×221195381² = 97854793151470322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221195371) 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, 392606 + ... + 393168.

It is an arithmetic number, because the mean of its divisors is an integer number (10801728).

Almost surely, 2^221195381 is an apocalyptic number.

It is an amenable number.

221195381 is a deficient number, since it is larger than the sum of its proper divisors (38046091).

221195381 is a wasteful number, since it uses less digits than its factorization.

221195381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 782 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 221195381 is about 14872.6386697183. The cubic root of 221195381 is about 604.7724764289.

The spelling of 221195381 in words is "two hundred twenty-one million, one hundred ninety-five thousand, three hundred eighty-one".