221437945 has 8 divisors (see below), whose sum is σ = 267356736. Its totient is φ = 176062896.

The previous prime is 221437943. The next prime is 221437967. The reversal of 221437945 is 549734122.

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 221437945 - 2¹ = 221437943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221437943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135037 + ... + 136666.

It is an arithmetic number, because the mean of its divisors is an integer number (33419592).

Almost surely, 2^221437945 is an apocalyptic number.

It is an amenable number.

221437945 is a deficient number, since it is larger than the sum of its proper divisors (45918791).

221437945 is a wasteful number, since it uses less digits than its factorization.

221437945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271871.

The product of its digits is 60480, while the sum is 37.

The square root of 221437945 is about 14880.7911416027. The cubic root of 221437945 is about 604.9934612139.

The spelling of 221437945 in words is "two hundred twenty-one million, four hundred thirty-seven thousand, nine hundred forty-five".