221100126 has 64 divisors (see below), whose sum is σ = 498548736. Its totient is φ = 64915200.

The previous prime is 221100107. The next prime is 221100133. The reversal of 221100126 is 621001122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149571 + ... + 151041.

It is an arithmetic number, because the mean of its divisors is an integer number (7789824).

Almost surely, 2^221100126 is an apocalyptic number.

221100126 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221100126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249274368).

221100126 is an abundant number, since it is smaller than the sum of its proper divisors (277448610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221100126 is a wasteful number, since it uses less digits than its factorization.

221100126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 221100126 is about 14869.4359677830. The cubic root of 221100126 is about 604.6856514189.

Adding to 221100126 its reverse (621001122), we get a palindrome (842101248).

The spelling of 221100126 in words is "two hundred twenty-one million, one hundred thousand, one hundred twenty-six".