19340921 has 2 divisors, whose sum is σ = 19340922.
Its totient is φ = 19340920.
The previous prime is 19340911. The next prime is 19340933. The reversal of 19340921 is 12904391.
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., 11155600 + 8185321 = 3340^2 + 2861^2
It is a cyclic number.
It is not a de Polignac number, because 19340921 - 214 = 19324537 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (19340911) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9670460 + 9670461.
It is an arithmetic number, because the mean of its divisors is an integer number (9670461).
Almost surely, 219340921 is an apocalyptic number.
It is an amenable number.
19340921 is a deficient number, since it is larger than the sum of its proper divisors (1).
19340921 is an equidigital number, since it uses as much as digits as its factorization.
19340921 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 1944, while the sum is 29.
The square root of 19340921 is about 4397.8313974049.
The cubic root of 19340921 is about 268.4267029298.
It can be divided in two parts, 193 and 40921, that added together give a palindrome (41114).
The spelling of 19340921 in words is "nineteen million, three hundred forty thousand, nine hundred twenty-one".