21599098 has 4 divisors (see below), whose sum is σ = 32398650. Its totient is φ = 10799548.

The previous prime is 21599089. The next prime is 21599099. The reversal of 21599098 is 89099512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21594609 + 4489 = 4647^2 + 67^2 .

It is not an unprimeable number, because it can be changed into a prime (21599099) 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 as a sum of consecutive naturals, namely, 5399773 + ... + 5399776.

Almost surely, 2^21599098 is an apocalyptic number.

21599098 is a deficient number, since it is larger than the sum of its proper divisors (10799552).

21599098 is a wasteful number, since it uses less digits than its factorization.

21599098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10799551.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 21599098 is about 4647.4829746864. The cubic root of 21599098 is about 278.4914533766.

The spelling of 21599098 in words is "twenty-one million, five hundred ninety-nine thousand, ninety-eight".