21056200246 has 8 divisors (see below), whose sum is σ = 32603148864. Its totient is φ = 10188483960.

The previous prime is 21056200237. The next prime is 21056200343. The reversal of 21056200246 is 64200265012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169808005 + ... + 169808128.

It is an arithmetic number, because the mean of its divisors is an integer number (4075393608).

Almost surely, 2^21056200246 is an apocalyptic number.

21056200246 is a deficient number, since it is larger than the sum of its proper divisors (11546948618).

21056200246 is a wasteful number, since it uses less digits than its factorization.

21056200246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339616166.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21056200246 its reverse (64200265012), we get a palindrome (85256465258).

The spelling of 21056200246 in words is "twenty-one billion, fifty-six million, two hundred thousand, two hundred forty-six".