19201421 has 8 divisors (see below), whose sum is σ = 19430400. Its totient is φ = 18974160.

The previous prime is 19201417. The next prime is 19201433. The reversal of 19201421 is 12410291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19201421 - 2² = 19201417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19201393 and 19201402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19201411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43520 + ... + 43958.

It is an arithmetic number, because the mean of its divisors is an integer number (2428800).

Almost surely, 2^19201421 is an apocalyptic number.

It is an amenable number.

19201421 is a deficient number, since it is larger than the sum of its proper divisors (228979).

19201421 is a wasteful number, since it uses less digits than its factorization.

19201421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 19201421 is about 4381.9426057401. The cubic root of 19201421 is about 267.7797858714.

The spelling of 19201421 in words is "nineteen million, two hundred one thousand, four hundred twenty-one".