21096658 has 32 divisors (see below), whose sum is σ = 36381312. Its totient is φ = 9081600.

The previous prime is 21096653. The next prime is 21096671. The reversal of 21096658 is 85669012.

It is not an unprimeable number, because it can be changed into a prime (21096653) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 87418 + ... + 87658.

It is an arithmetic number, because the mean of its divisors is an integer number (1136916).

Almost surely, 2^21096658 is an apocalyptic number.

21096658 is a deficient number, since it is larger than the sum of its proper divisors (15284654).

21096658 is a wasteful number, since it uses less digits than its factorization.

21096658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 21096658 is about 4593.1098397491. The cubic root of 21096658 is about 276.3150588974.

The spelling of 21096658 in words is "twenty-one million, ninety-six thousand, six hundred fifty-eight".