19946421 has 24 divisors (see below), whose sum is σ = 31726656. Its totient is φ = 11975040.

The previous prime is 19946419. The next prime is 19946429. The reversal of 19946421 is 12464991.

It is a happy number.

19946421 is a `hidden beast` number, since 1 + 9 + 9 + 4 + 642 + 1 = 666.

It is not a de Polignac number, because 19946421 - 2¹ = 19946419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19946429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10296 + ... + 12078.

It is an arithmetic number, because the mean of its divisors is an integer number (1321944).

Almost surely, 2^19946421 is an apocalyptic number.

19946421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19946421 is a deficient number, since it is larger than the sum of its proper divisors (11780235).

19946421 is a wasteful number, since it uses less digits than its factorization.

19946421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1910 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 19946421 is about 4466.1416233702. The cubic root of 19946421 is about 271.1991519148.

The spelling of 19946421 in words is "nineteen million, nine hundred forty-six thousand, four hundred twenty-one".