19820121 has 8 divisors (see below), whose sum is σ = 26447424. Its totient is φ = 13203120.

The previous prime is 19820117. The next prime is 19820153. The reversal of 19820121 is 12102891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19820121 - 2² = 19820117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19820091 and 19820100.

It is not an unprimeable number, because it can be changed into a prime (19820111) 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, 5956 + ... + 8666.

It is an arithmetic number, because the mean of its divisors is an integer number (3305928).

Almost surely, 2^19820121 is an apocalyptic number.

It is an amenable number.

19820121 is a deficient number, since it is larger than the sum of its proper divisors (6627303).

19820121 is a wasteful number, since it uses less digits than its factorization.

19820121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 19820121 is about 4451.9794473919. The cubic root of 19820121 is about 270.6255318257.

The spelling of 19820121 in words is "nineteen million, eight hundred twenty thousand, one hundred twenty-one".