221949381 has 8 divisors (see below), whose sum is σ = 296116704. Its totient is φ = 147874160.

The previous prime is 221949373. The next prime is 221949401. The reversal of 221949381 is 183949122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221949381 - 2³ = 221949373 is a prime.

It is a super-2 number, since 2×221949381² = 98523055452566322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221949311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17190 + ... + 27191.

It is an arithmetic number, because the mean of its divisors is an integer number (37014588).

Almost surely, 2^221949381 is an apocalyptic number.

It is an amenable number.

221949381 is a deficient number, since it is larger than the sum of its proper divisors (74167323).

221949381 is a wasteful number, since it uses less digits than its factorization.

221949381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46051.

The product of its digits is 31104, while the sum is 39.

The square root of 221949381 is about 14897.9656664929. The cubic root of 221949381 is about 605.4588700534.

The spelling of 221949381 in words is "two hundred twenty-one million, nine hundred forty-nine thousand, three hundred eighty-one".