19648121 has 4 divisors (see below), whose sum is σ = 19981200. Its totient is φ = 19315044.

The previous prime is 19648103. The next prime is 19648127. The reversal of 19648121 is 12184691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12184691 = 461 ⋅26431.

It is a cyclic number.

It is not a de Polignac number, because 19648121 - 2¹⁰ = 19647097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19648127) 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, 166451 + ... + 166568.

It is an arithmetic number, because the mean of its divisors is an integer number (4995300).

Almost surely, 2^19648121 is an apocalyptic number.

It is an amenable number.

19648121 is a deficient number, since it is larger than the sum of its proper divisors (333079).

19648121 is an equidigital number, since it uses as much as digits as its factorization.

19648121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333078.

The product of its digits is 3456, while the sum is 32.

The square root of 19648121 is about 4432.6201055358. The cubic root of 19648121 is about 269.8404223932.

The spelling of 19648121 in words is "nineteen million, six hundred forty-eight thousand, one hundred twenty-one".