21019101 has 8 divisors (see below), whose sum is σ = 28709184. Its totient is φ = 13670880.

The previous prime is 21019069. The next prime is 21019127. The reversal of 21019101 is 10191012.

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

It is not a de Polignac number, because 21019101 - 2⁵ = 21019069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21019151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85321 + ... + 85566.

It is an arithmetic number, because the mean of its divisors is an integer number (3588648).

Almost surely, 2^21019101 is an apocalyptic number.

It is an amenable number.

21019101 is a deficient number, since it is larger than the sum of its proper divisors (7690083).

21019101 is a wasteful number, since it uses less digits than its factorization.

21019101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170931.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 21019101 is about 4584.6593112248. The cubic root of 21019101 is about 275.9760402431.

The spelling of 21019101 in words is "twenty-one million, nineteen thousand, one hundred one".