221106538 has 8 divisors (see below), whose sum is σ = 331856388. Its totient is φ = 110487744.

The previous prime is 221106533. The next prime is 221106541. The reversal of 221106538 is 835601122.

It can be written as a sum of positive squares in 2 ways, for example, as 202123089 + 18983449 = 14217^2 + 4357^2 .

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

It is a super-2 number, since 2×221106538² = 97776202292690888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221106533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28431 + ... + 35362.

Almost surely, 2^221106538 is an apocalyptic number.

221106538 is a deficient number, since it is larger than the sum of its proper divisors (110749850).

221106538 is a wasteful number, since it uses less digits than its factorization.

221106538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65528.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 221106538 is about 14869.6515762811. The cubic root of 221106538 is about 604.6914967448.

The spelling of 221106538 in words is "two hundred twenty-one million, one hundred six thousand, five hundred thirty-eight".