21355107 has 16 divisors (see below), whose sum is σ = 31008000. Its totient is φ = 13021344.

The previous prime is 21355097. The next prime is 21355121. The reversal of 21355107 is 70155312.

It is not a de Polignac number, because 21355107 - 2⁴ = 21355091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21355007) 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 15 ways as a sum of consecutive naturals, for example, 4807 + ... + 8112.

It is an arithmetic number, because the mean of its divisors is an integer number (1938000).

Almost surely, 2^21355107 is an apocalyptic number.

21355107 is a deficient number, since it is larger than the sum of its proper divisors (9652893).

21355107 is a wasteful number, since it uses less digits than its factorization.

21355107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12970.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 21355107 is about 4621.1586209521. The cubic root of 21355107 is about 277.4388340151.

The spelling of 21355107 in words is "twenty-one million, three hundred fifty-five thousand, one hundred seven".