103890421 has 2 divisors, whose sum is σ = 103890422. Its totient is φ = 103890420.

The previous prime is 103890419. The next prime is 103890431. The reversal of 103890421 is 124098301.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101787921 + 2102500 = 10089^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 103890421 - 2¹ = 103890419 is a prime.

Together with 103890419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 103890421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103890431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51945210 + 51945211.

It is an arithmetic number, because the mean of its divisors is an integer number (51945211).

Almost surely, 2^103890421 is an apocalyptic number.

It is an amenable number.

103890421 is a deficient number, since it is larger than the sum of its proper divisors (1).

103890421 is an equidigital number, since it uses as much as digits as its factorization.

103890421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 103890421 is about 10192.6650587567. The cubic root of 103890421 is about 470.1017148200.

The spelling of 103890421 in words is "one hundred three million, eight hundred ninety thousand, four hundred twenty-one".