103972021 has 2 divisors, whose sum is σ = 103972022. Its totient is φ = 103972020.

The previous prime is 103972019. The next prime is 103972039. The reversal of 103972021 is 120279301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53363025 + 50608996 = 7305^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 103972021 - 2¹ = 103972019 is a prime.

Together with 103972019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103972621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51986010 + 51986011.

It is an arithmetic number, because the mean of its divisors is an integer number (51986011).

Almost surely, 2^103972021 is an apocalyptic number.

It is an amenable number.

103972021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103972021 is an equidigital number, since it uses as much as digits as its factorization.

103972021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 103972021 is about 10196.6671515746. The cubic root of 103972021 is about 470.2247619712.

The spelling of 103972021 in words is "one hundred three million, nine hundred seventy-two thousand, twenty-one".