21107498 has 4 divisors (see below), whose sum is σ = 31661250. Its totient is φ = 10553748.

The previous prime is 21107483. The next prime is 21107509. The reversal of 21107498 is 89470112.

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., 18207289 + 2900209 = 4267^2 + 1703^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5276873 + ... + 5276876.

Almost surely, 2^21107498 is an apocalyptic number.

21107498 is a deficient number, since it is larger than the sum of its proper divisors (10553752).

21107498 is a wasteful number, since it uses less digits than its factorization.

21107498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10553751.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21107498 is about 4594.2897165939. The cubic root of 21107498 is about 276.3623766980.

The spelling of 21107498 in words is "twenty-one million, one hundred seven thousand, four hundred ninety-eight".