21004000246 has 32 divisors (see below), whose sum is σ = 33664435200. Its totient is φ = 9810069192.

The previous prime is 21004000229. The next prime is 21004000261. The reversal of 21004000246 is 64200040012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3654451 + ... + 3660193.

It is an arithmetic number, because the mean of its divisors is an integer number (1052013600).

Almost surely, 2^21004000246 is an apocalyptic number.

21004000246 is a deficient number, since it is larger than the sum of its proper divisors (12660434954).

21004000246 is an frugal number, since it uses more digits than its factorization.

With its predecessor (21004000245) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (5897).

21004000246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5897 (or 5811 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21004000246 its reverse (64200040012), we get a palindrome (85204040258).

The spelling of 21004000246 in words is "twenty-one billion, four million, two hundred forty-six", and thus it is an aban number.