103553621 has 4 divisors (see below), whose sum is σ = 103672044. Its totient is φ = 103435200.

The previous prime is 103553617. The next prime is 103553627. The reversal of 103553621 is 126355301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126355301 = 19 ⋅6650279.

It can be written as a sum of positive squares in 2 ways, for example, as 11662225 + 91891396 = 3415^2 + 9586^2 .

It is a cyclic number.

It is not a de Polignac number, because 103553621 - 2² = 103553617 is a prime.

It is a super-3 number, since 3×103553621³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103553627) 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, 57890 + ... + 59651.

It is an arithmetic number, because the mean of its divisors is an integer number (25918011).

Almost surely, 2^103553621 is an apocalyptic number.

It is an amenable number.

103553621 is a deficient number, since it is larger than the sum of its proper divisors (118423).

103553621 is an equidigital number, since it uses as much as digits as its factorization.

103553621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118422.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 103553621 is about 10176.1299618273. The cubic root of 103553621 is about 469.5931608372.

The spelling of 103553621 in words is "one hundred three million, five hundred fifty-three thousand, six hundred twenty-one".