21019108 has 24 divisors (see below), whose sum is σ = 41215104. Its totient is φ = 9295200.

The previous prime is 21019069. The next prime is 21019127. The reversal of 21019108 is 80191012.

It is a super-2 number, since 2×21019108² = 883605802231328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4828 + ... + 8083.

It is an arithmetic number, because the mean of its divisors is an integer number (1717296).

Almost surely, 2^21019108 is an apocalyptic number.

It is an amenable number.

21019108 is a deficient number, since it is larger than the sum of its proper divisors (20195996).

21019108 is a wasteful number, since it uses less digits than its factorization.

21019108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12963 (or 12961 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 21019108 is about 4584.6600746402. The cubic root of 21019108 is about 275.9760708793.

The spelling of 21019108 in words is "twenty-one million, nineteen thousand, one hundred eight".