21842146 has 8 divisors (see below), whose sum is σ = 32846940. Its totient is φ = 10893168.

The previous prime is 21842137. The next prime is 21842147. The reversal of 21842146 is 64124812.

It can be written as a sum of positive squares in 2 ways, for example, as 21058921 + 783225 = 4589^2 + 885^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21842147) 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 in 3 ways as a sum of consecutive naturals, for example, 12961 + ... + 14548.

Almost surely, 2^21842146 is an apocalyptic number.

21842146 is a deficient number, since it is larger than the sum of its proper divisors (11004794).

21842146 is a wasteful number, since it uses less digits than its factorization.

21842146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27908.

The product of its digits is 3072, while the sum is 28.

The square root of 21842146 is about 4673.5581733835. The cubic root of 21842146 is about 279.5321523896.

Adding to 21842146 its reverse (64124812), we get a palindrome (85966958).

It can be divided in two parts, 2184 and 2146, that multiplied together give a palindrome (4686864).

The spelling of 21842146 in words is "twenty-one million, eight hundred forty-two thousand, one hundred forty-six".