103555221 has 32 divisors (see below), whose sum is σ = 177709056. Its totient is φ = 52056000.

The previous prime is 103555189. The next prime is 103555261. The reversal of 103555221 is 122555301.

It is a happy number.

It is not a de Polignac number, because 103555221 - 2⁵ = 103555189 is a prime.

It is a super-3 number, since 3×103555221³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 103555191 and 103555200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103555261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70 + ... + 14391.

It is an arithmetic number, because the mean of its divisors is an integer number (5553408).

Almost surely, 2^103555221 is an apocalyptic number.

103555221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

103555221 is a deficient number, since it is larger than the sum of its proper divisors (74153835).

103555221 is a wasteful number, since it uses less digits than its factorization.

103555221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14513.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 103555221 is about 10176.2085768718. The cubic root of 103555221 is about 469.5955793755.

It can be divided in two parts, 10355 and 5221, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 103555221 in words is "one hundred three million, five hundred fifty-five thousand, two hundred twenty-one".