21011000446 has 4 divisors (see below), whose sum is σ = 31516500672. Its totient is φ = 10505500222.

The previous prime is 21011000443. The next prime is 21011000497. The reversal of 21011000446 is 64400011012.

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 (21011000443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252750110 + ... + 5252750113.

It is an arithmetic number, because the mean of its divisors is an integer number (7879125168).

Almost surely, 2^21011000446 is an apocalyptic number.

21011000446 is a deficient number, since it is larger than the sum of its proper divisors (10505500226).

21011000446 is a wasteful number, since it uses less digits than its factorization.

21011000446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505500225.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21011000446 its reverse (64400011012), we get a palindrome (85411011458).

The spelling of 21011000446 in words is "twenty-one billion, eleven million, four hundred forty-six", and thus it is an aban number.