19930121 has 8 divisors (see below), whose sum is σ = 20891520. Its totient is φ = 18976672.

The previous prime is 19930111. The next prime is 19930129. The reversal of 19930121 is 12103991.

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 19930121 - 2¹⁴ = 19913737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19930129) 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, 3500 + ... + 7218.

It is an arithmetic number, because the mean of its divisors is an integer number (2611440).

Almost surely, 2^19930121 is an apocalyptic number.

It is an amenable number.

19930121 is a deficient number, since it is larger than the sum of its proper divisors (961399).

19930121 is a wasteful number, since it uses less digits than its factorization.

19930121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 19930121 is about 4464.3164090373. The cubic root of 19930121 is about 271.1252581092.

The spelling of 19930121 in words is "nineteen million, nine hundred thirty thousand, one hundred twenty-one".