19942021 has 8 divisors (see below), whose sum is σ = 22457088. Its totient is φ = 17544000.

The previous prime is 19942019. The next prime is 19942033. The reversal of 19942021 is 12024991.

It is a happy number.

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 19942021 - 2¹ = 19942019 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 (19942051) 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, 28900 + ... + 29581.

It is an arithmetic number, because the mean of its divisors is an integer number (2807136).

Almost surely, 2^19942021 is an apocalyptic number.

19942021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19942021 is a deficient number, since it is larger than the sum of its proper divisors (2515067).

19942021 is a wasteful number, since it uses less digits than its factorization.

19942021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58523.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 19942021 is about 4465.6490009852. The cubic root of 19942021 is about 271.1792090886.

The spelling of 19942021 in words is "nineteen million, nine hundred forty-two thousand, twenty-one".