19421307 has 6 divisors (see below), whose sum is σ = 28053012. Its totient is φ = 12947532.

The previous prime is 19421239. The next prime is 19421323. The reversal of 19421307 is 70312491.

It is not a de Polignac number, because 19421307 - 2⁷ = 19421179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19421807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1078953 + ... + 1078970.

It is an arithmetic number, because the mean of its divisors is an integer number (4675502).

Almost surely, 2^19421307 is an apocalyptic number.

19421307 is a deficient number, since it is larger than the sum of its proper divisors (8631705).

19421307 is a wasteful number, since it uses less digits than its factorization.

19421307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157929 (or 2157926 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 19421307 is about 4406.9611979231. The cubic root of 19421307 is about 268.7980731022.

Adding to 19421307 its reverse (70312491), we get a palindrome (89733798).

It can be divided in two parts, 1942 and 1307, that added together give a square (3249 = 57²).

The spelling of 19421307 in words is "nineteen million, four hundred twenty-one thousand, three hundred seven".