21610798 has 16 divisors (see below), whose sum is σ = 35680176. Its totient is φ = 9735040.

The previous prime is 21610781. The next prime is 21610807. The reversal of 21610798 is 89701612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 1861 + ... + 6832.

It is an arithmetic number, because the mean of its divisors is an integer number (2230011).

Almost surely, 2^21610798 is an apocalyptic number.

21610798 is a deficient number, since it is larger than the sum of its proper divisors (14069378).

21610798 is a wasteful number, since it uses less digits than its factorization.

21610798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8819.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21610798 is about 4648.7415501402. The cubic root of 21610798 is about 278.5417295786.

The spelling of 21610798 in words is "twenty-one million, six hundred ten thousand, seven hundred ninety-eight".