19420101 has 32 divisors (see below), whose sum is σ = 30119040. Its totient is φ = 12355200.

The previous prime is 19420081. The next prime is 19420123. The reversal of 19420101 is 10102491.

It is not a de Polignac number, because 19420101 - 2⁷ = 19419973 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 (19420201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58506 + ... + 58836.

It is an arithmetic number, because the mean of its divisors is an integer number (941220).

Almost surely, 2^19420101 is an apocalyptic number.

It is an amenable number.

19420101 is a deficient number, since it is larger than the sum of its proper divisors (10698939).

19420101 is a wasteful number, since it uses less digits than its factorization.

19420101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 19420101 is about 4406.8243668202. The cubic root of 19420101 is about 268.7925091583.

Adding to 19420101 its reverse (10102491), we get a palindrome (29522592).

The spelling of 19420101 in words is "nineteen million, four hundred twenty thousand, one hundred one".