21086954 has 32 divisors (see below), whose sum is σ = 37584000. Its totient is φ = 8867040.

The previous prime is 21086921. The next prime is 21086957. The reversal of 21086954 is 45968012.

It is not an unprimeable number, because it can be changed into a prime (21086957) 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, 40214 + ... + 40734.

It is an arithmetic number, because the mean of its divisors is an integer number (1174500).

Almost surely, 2^21086954 is an apocalyptic number.

21086954 is a deficient number, since it is larger than the sum of its proper divisors (16497046).

21086954 is an equidigital number, since it uses as much as digits as its factorization.

21086954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21086954 is about 4592.0533533486. The cubic root of 21086954 is about 276.2726861108.

The spelling of 21086954 in words is "twenty-one million, eighty-six thousand, nine hundred fifty-four".