21019107 has 8 divisors (see below), whose sum is σ = 28297984. Its totient is φ = 13876488.

The previous prime is 21019069. The next prime is 21019127. The reversal of 21019107 is 70191012.

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

It is not a de Polignac number, because 21019107 - 2⁶ = 21019043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21019127) 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, 33703 + ... + 34320.

It is an arithmetic number, because the mean of its divisors is an integer number (3537248).

Almost surely, 2^21019107 is an apocalyptic number.

21019107 is a deficient number, since it is larger than the sum of its proper divisors (7278877).

21019107 is a wasteful number, since it uses less digits than its factorization.

21019107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68129.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 21019107 is about 4584.6599655809. The cubic root of 21019107 is about 275.9760665027.

The spelling of 21019107 in words is "twenty-one million, nineteen thousand, one hundred seven".