21654098 has 4 divisors (see below), whose sum is σ = 32481150. Its totient is φ = 10827048.

The previous prime is 21654071. The next prime is 21654103. The reversal of 21654098 is 89045612.

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., 21187609 + 466489 = 4603^2 + 683^2 .

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 as a sum of consecutive naturals, namely, 5413523 + ... + 5413526.

Almost surely, 2^21654098 is an apocalyptic number.

21654098 is a deficient number, since it is larger than the sum of its proper divisors (10827052).

21654098 is a wasteful number, since it uses less digits than its factorization.

21654098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10827051.

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

The square root of 21654098 is about 4653.3963940331. The cubic root of 21654098 is about 278.7276368071.

The spelling of 21654098 in words is "twenty-one million, six hundred fifty-four thousand, ninety-eight".