21161486 has 4 divisors (see below), whose sum is σ = 31742232. Its totient is φ = 10580742.

The previous prime is 21161467. The next prime is 21161489. The reversal of 21161486 is 68416112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161489) by changing a digit.

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, 5290370 + ... + 5290373.

It is an arithmetic number, because the mean of its divisors is an integer number (7935558).

Almost surely, 2^21161486 is an apocalyptic number.

21161486 is a deficient number, since it is larger than the sum of its proper divisors (10580746).

21161486 is a wasteful number, since it uses less digits than its factorization.

21161486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10580745.

The product of its digits is 2304, while the sum is 29.

The square root of 21161486 is about 4600.1615189034. The cubic root of 21161486 is about 276.5977993459.

Adding to 21161486 its reverse (68416112), we get a palindrome (89577598).

The spelling of 21161486 in words is "twenty-one million, one hundred sixty-one thousand, four hundred eighty-six".