19912101 has 16 divisors (see below), whose sum is σ = 29671488. Its totient is φ = 11772800.

The previous prime is 19912097. The next prime is 19912111. The reversal of 19912101 is 10121991.

It is a cyclic number.

It is not a de Polignac number, because 19912101 - 2² = 19912097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6006 + ... + 8711.

It is an arithmetic number, because the mean of its divisors is an integer number (1854468).

Almost surely, 2^19912101 is an apocalyptic number.

19912101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19912101 is a deficient number, since it is larger than the sum of its proper divisors (9759387).

19912101 is a wasteful number, since it uses less digits than its factorization.

19912101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14772.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 19912101 is about 4462.2977265082. The cubic root of 19912101 is about 271.0435200143.

The spelling of 19912101 in words is "nineteen million, nine hundred twelve thousand, one hundred one".