103721821 has 8 divisors (see below), whose sum is σ = 119033024. Its totient is φ = 88534080.

The previous prime is 103721801. The next prime is 103721837. The reversal of 103721821 is 128127301.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103721821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103721801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29055 + ... + 32428.

It is an arithmetic number, because the mean of its divisors is an integer number (14879128).

Almost surely, 2^103721821 is an apocalyptic number.

It is an amenable number.

103721821 is a deficient number, since it is larger than the sum of its proper divisors (15311203).

103721821 is an equidigital number, since it uses as much as digits as its factorization.

103721821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61731.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 103721821 is about 10184.3910470877. The cubic root of 103721821 is about 469.8472734491.

The spelling of 103721821 in words is "one hundred three million, seven hundred twenty-one thousand, eight hundred twenty-one".