221101426 has 24 divisors (see below), whose sum is σ = 415478700. Its totient is φ = 87468192.

The previous prime is 221101421. The next prime is 221101453. The reversal of 221101426 is 624101122.

It can be written as a sum of positive squares in 2 ways, for example, as 194630401 + 26471025 = 13951^2 + 5145^2 .

It is not an unprimeable number, because it can be changed into a prime (221101421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85501 + ... + 88048.

Almost surely, 2^221101426 is an apocalyptic number.

221101426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221101426 is a deficient number, since it is larger than the sum of its proper divisors (194377274).

221101426 is a wasteful number, since it uses less digits than its factorization.

221101426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173578 (or 173571 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 221101426 is about 14869.4796815490. The cubic root of 221101426 is about 604.6868365378.

Adding to 221101426 its reverse (624101122), we get a palindrome (845202548).

The spelling of 221101426 in words is "two hundred twenty-one million, one hundred one thousand, four hundred twenty-six".