19401121 has 4 divisors (see below), whose sum is σ = 20244672. Its totient is φ = 18557572.

The previous prime is 19401091. The next prime is 19401143. The reversal of 19401121 is 12110491.

19401121 is nontrivially palindromic in base 5.

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.

It is a cyclic number.

It is not a de Polignac number, because 19401121 - 2⁹ = 19400609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19402121) 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, 421741 + ... + 421786.

It is an arithmetic number, because the mean of its divisors is an integer number (5061168).

Almost surely, 2^19401121 is an apocalyptic number.

It is an amenable number.

19401121 is a deficient number, since it is larger than the sum of its proper divisors (843551).

19401121 is an equidigital number, since it uses as much as digits as its factorization.

19401121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843550.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 19401121 is about 4404.6703622405. The cubic root of 19401121 is about 268.7049135831.

The spelling of 19401121 in words is "nineteen million, four hundred one thousand, one hundred twenty-one".