19941421 has 4 divisors (see below), whose sum is σ = 19954144. Its totient is φ = 19928700.

The previous prime is 19941419. The next prime is 19941433. The reversal of 19941421 is 12414991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12414991 = 109 ⋅113899.

It is a cyclic number.

It is not a de Polignac number, because 19941421 - 2¹ = 19941419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19941461) 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, 3615 + ... + 7276.

It is an arithmetic number, because the mean of its divisors is an integer number (4988536).

Almost surely, 2^19941421 is an apocalyptic number.

It is an amenable number.

19941421 is a deficient number, since it is larger than the sum of its proper divisors (12723).

19941421 is a wasteful number, since it uses less digits than its factorization.

19941421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12722.

The product of its digits is 2592, while the sum is 31.

The square root of 19941421 is about 4465.5818209949. The cubic root of 19941421 is about 271.1764893850.

The spelling of 19941421 in words is "nineteen million, nine hundred forty-one thousand, four hundred twenty-one".