21099862 has 16 divisors (see below), whose sum is σ = 36241920. Its totient is φ = 9025128.

The previous prime is 21099833. The next prime is 21099863. The reversal of 21099862 is 26899012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21099863) 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 7 ways as a sum of consecutive naturals, for example, 8083 + ... + 10369.

It is an arithmetic number, because the mean of its divisors is an integer number (2265120).

Almost surely, 2^21099862 is an apocalyptic number.

21099862 is a deficient number, since it is larger than the sum of its proper divisors (15142058).

21099862 is a wasteful number, since it uses less digits than its factorization.

21099862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21099862 is about 4593.4586098059. The cubic root of 21099862 is about 276.3290463993.

The spelling of 21099862 in words is "twenty-one million, ninety-nine thousand, eight hundred sixty-two".