21010246 has 4 divisors (see below), whose sum is σ = 31515372. Its totient is φ = 10505122.

The previous prime is 21010237. The next prime is 21010259. The reversal of 21010246 is 64201012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252560 + ... + 5252563.

It is an arithmetic number, because the mean of its divisors is an integer number (7878843).

Almost surely, 2^21010246 is an apocalyptic number.

21010246 is a deficient number, since it is larger than the sum of its proper divisors (10505126).

21010246 is a wasteful number, since it uses less digits than its factorization.

21010246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505125.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21010246 is about 4583.6934888799. The cubic root of 21010246 is about 275.9372800841.

Adding to 21010246 its reverse (64201012), we get a palindrome (85211258).

The spelling of 21010246 in words is "twenty-one million, ten thousand, two hundred forty-six".