21700498 has 8 divisors (see below), whose sum is σ = 32693580. Its totient is φ = 10802640.

The previous prime is 21700493. The next prime is 21700501. The reversal of 21700498 is 89400712.

It can be written as a sum of positive squares in 2 ways, for example, as 16785409 + 4915089 = 4097^2 + 2217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21700498² = 941823226896008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21700493) 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 in 3 ways as a sum of consecutive naturals, for example, 23233 + ... + 24148.

Almost surely, 2^21700498 is an apocalyptic number.

21700498 is a deficient number, since it is larger than the sum of its proper divisors (10993082).

21700498 is a wasteful number, since it uses less digits than its factorization.

21700498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47612.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21700498 is about 4658.3793319136. The cubic root of 21700498 is about 278.9265789169.

The spelling of 21700498 in words is "twenty-one million, seven hundred thousand, four hundred ninety-eight".