21641498 has 4 divisors (see below), whose sum is σ = 32462250. Its totient is φ = 10820748.

The previous prime is 21641483. The next prime is 21641509. The reversal of 21641498 is 89414612.

It is a happy number.

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., 20675209 + 966289 = 4547^2 + 983^2 .

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, 5410373 + ... + 5410376.

Almost surely, 2^21641498 is an apocalyptic number.

21641498 is a deficient number, since it is larger than the sum of its proper divisors (10820752).

21641498 is a wasteful number, since it uses less digits than its factorization.

21641498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10820751.

The product of its digits is 13824, while the sum is 35.

The square root of 21641498 is about 4652.0423471847. The cubic root of 21641498 is about 278.6735646769.

It can be divided in two parts, 216 and 41498, that added together give a palindrome (41714).

The spelling of 21641498 in words is "twenty-one million, six hundred forty-one thousand, four hundred ninety-eight".