19421000 has 32 divisors (see below), whose sum is σ = 45447480. Its totient is φ = 7768000.

The previous prime is 19420979. The next prime is 19421009. The reversal of 19421000 is 12491.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11792356 + 7628644 = 3434^2 + 2762^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19421000.

It is not an unprimeable number, because it can be changed into a prime (19421009) 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, 8711 + ... + 10710.

Almost surely, 2^19421000 is an apocalyptic number.

19421000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19421000 is an abundant number, since it is smaller than the sum of its proper divisors (26026480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19421000 is a wasteful number, since it uses less digits than its factorization.

19421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19442 (or 19428 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 19421000 is about 4406.9263665280. The cubic root of 19421000 is about 268.7966567635.

Adding to 19421000 its reverse (12491), we get a palindrome (19433491).

The spelling of 19421000 in words is "nineteen million, four hundred twenty-one thousand".