21098662 has 16 divisors (see below), whose sum is σ = 35183232. Its totient is φ = 9423360.

The previous prime is 21098657. The next prime is 21098663. The reversal of 21098662 is 26689012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21098663) 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 7 ways as a sum of consecutive naturals, for example, 12283 + ... + 13894.

It is an arithmetic number, because the mean of its divisors is an integer number (2198952).

Almost surely, 2^21098662 is an apocalyptic number.

21098662 is a deficient number, since it is larger than the sum of its proper divisors (14084570).

21098662 is a wasteful number, since it uses less digits than its factorization.

21098662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26223.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 21098662 is about 4593.3279874183. The cubic root of 21098662 is about 276.3238078004.

The spelling of 21098662 in words is "twenty-one million, ninety-eight thousand, six hundred sixty-two".